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G-Shock G-Steel Watch GST-B400AD-1A4
G-Shock G-Steel Watch GST-B400AD-1A4
G-Shock G-Steel Watch GST-B400AD-1A4
G-Shock G-Steel Watch GST-B400AD-1A4
G-Shock G-Steel Watch GST-B400AD-1A4
G-Shock G-Steel Watch GST-B400AD-1A4
G-Shock G-Steel Watch GST-B400AD-1A4
G-Shock G-Steel Watch GST-B400AD-1A4
G-Shock G-Steel Watch GST-B400AD-1A4
G-Shock G-Steel Watch GST-B400AD-1A4
G-Shock G-Steel Watch GST-B400AD-1A4
G-Shock G-Steel Watch GST-B400AD-1A4
G-Shock G-Steel Watch GST-B400AD-1A4
G-Shock G-Steel Watch GST-B400AD-1A4
G-Shock G-Steel Watch GST-B400AD-1A4
G-Shock G-Steel Watch GST-B400AD-1A4

G-Shock G-Steel Watch GST-B400AD-1A4

(703 reviews)

Introducing new colour variations to the line up of slim G-STEEL GST-B400 models with new, improved designs made possible by a thin module and carbon core guard structure. The GST-B400AD comes with a black ion-plated (IP) bezel combined with a vapor deposition dial in G-SHOCK red.The GST-B400 is made possible by even further miniaturization of its parts and thinning of its modules without sacrificing any Bluetooth or solar function. Power consumption has also been significantly reduced.In addition, the carbon core guard structure of this model helps to make it the thinnest of the G-STEEL Series (as of Apr 2021) while maintaining a high level of impact resistance.

Introducing new colour variations to the line up of slim G-STEEL GST-B400 models with new, improved designs made possible by a thin module and carbon core guard structure. The GST-B400AD comes with a black ion-plated (IP) bezel combined with a vapor deposition dial in G-SHOCK red.The GST-B400 is made possible by even further miniaturization of its parts and thinning of its modules without sacrificing any Bluetooth or solar function. Power consumption has also been significantly reduced.In addition, the carbon core guard structure of this model helps to make it the thinnest of the G-STEEL Series (as of Apr 2021) while maintaining a high level of impact resistance.

$419.84 - $976.72

in 15 offers

last seen 10 May 2026

The lowest price we last saw for G-Shock G-Steel Watch GST-B400AD-1A4 was $419.84 at eBay.com.au, compared across 13 retailers (last seen 10 May 2026). Prices may have changed since.

The all-time low we recorded was $380.70 on 29 Apr 2026.

Prices last updated 10 May 2026.

Colour:

Black

G-Shock G-Steel Watch GST-B400AD-1A4

$419.84

last seen 10 May 2026
(703 reviews)

Introducing new colour variations to the line up of slim G-STEEL GST-B400 models with new, improved designs made possible by a thin module and carbon core guard structure. The GST-B400AD comes with a black ion-plated (IP) bezel combined with a vapor deposition dial in G-SHOCK red.The GST-B400 is made possible by even further miniaturization of its parts and thinning of its modules without sacrificing any Bluetooth or solar function. Power consumption has also been significantly reduced.In addition, the carbon core guard structure of this model helps to make it the thinnest of the G-STEEL Series (as of Apr 2021) while maintaining a high level of impact resistance.

Introducing new colour variations to the line up of slim G-STEEL GST-B400 models with new, improved designs made possible by a thin module and carbon core guard structure. The GST-B400AD comes with a black ion-plated (IP) bezel combined with a vapor deposition dial in G-SHOCK red.The GST-B400 is made possible by even further miniaturization of its parts and thinning of its modules without sacrificing any Bluetooth or solar function. Power consumption has also been significantly reduced.In addition, the carbon core guard structure of this model helps to make it the thinnest of the G-STEEL Series (as of Apr 2021) while maintaining a high level of impact resistance.

Black, Blue
Blue
Silver, Red

Price comparison

Price data powered by pricesAPI.io

Last updated at 10/05/2026 21:56:21

Please note: price history and price alerts are not available for some stores, including Amazon.com.au.
https://www.google.com/s2/favicons?domain=ebay.com.au&sz=64eBay.com.au

$419.84

Casio Gst-b400 Watch

Free delivery

Affiliate Disclosure: We may receive a small commission for purchases made through this link at no extra cost to you. This helps support our site. Thank you!

https://www.google.com/s2/favicons?domain=monawatch.com&sz=64Monawatch

$423.97

Casio G-Shock GST-B400AD-1A4 Red Dial Men’s Watch

Delivery $35.80

https://www.google.com/s2/favicons?domain=shiels.com.au&sz=64Shiels

$523.00

G-Shock GSTB400AD-1A4 G-Steel - Shiels Jewellers

Free delivery

https://www.google.com/s2/favicons?domain=grahams.com.au&sz=64Grahams Jewellers

$523.00

G-Shock GSTB400AD-1A4 G-Steel - Grahams Jewellers

Free delivery between 13–18 May

https://www.google.com/s2/favicons?domain=joom.com&sz=64Joom

$546.00

CASIO Men Red Watch GST-B400AD-1A4 GST-B400AD-1A4 Random Watch Box

Delivery between 12–23 May $6

https://www.google.com/s2/favicons?domain=downunderwatches.com&sz=64DownUnderWatches.com

$554.00

Casio G-Shock G-Steel Mobile Link Analog Digital Tough Solar GST-B400AD-1A4 GSTB400AD-1 200M Men's Watch

Free delivery

https://www.google.com/s2/favicons?domain=buymobile.com.au&sz=64Buy Mobile Australia

$592.95

Casio G-Shock G-Steel Watch GST-B400AD-1A4

Delivery between 15–22 May $14.95

https://www.google.com/s2/favicons?domain=scarce.co&sz=64Scarce & Co

$599.00

G-Shock G-Steel Watch GST-B400AD-1A4

30-day returns

https://www.google.com/s2/favicons?domain=publicwatch.com&sz=64PublicWatch.com

$633.78

Casio G-Shock G-Steel GST-B400AD-1A4 Analog-Digital Combination

Delivery $35.30

https://www.google.com/s2/favicons?domain=iceonline.com.au&sz=64Ice Jewellery

$749.00

G-Shock GSTB400AD-1A4 G-Steel

Free delivery

Price history

Price history

Please note: price history and price alerts are not available for some stores, including Amazon.com.au.

Reviews

16 November 2021

originally posted on creationwatches.com

I am happy with the quality of the Casio GST-B400 red. Geniune watchbox. Only one problem with tax amount 21%, not explain during the process of the order. That means, the Creationwatch pricetax included is the same with french market. The difference is only the red color not available on european market. So I am happy. 5 stars for watch 3 stars for missing amount tax

28 January 2020jenn.f

originally posted on influenster.com

I have the grey version of this watch. I love to use it while outdoors or going hiking. It has the triple sensor on it. Temp, barometer, compass and altitude readings. It's powered by solar and can get a good 8 to 10 months easy on a little charge. I find it to be very trendy, nice and durable. Never had a single issue with it. It does take a minute to learn how to set it and the manual is pretty thick. I would recommend this watch for anyone who hikes, mountain climbs or like me to camp out ride a bike with. It's a solid watch that can take a beating! This is a HUGE watch, not big but huge. So if you have small wrists, this won't be a good fit. The dial is the solar panel. What it isn't: Isn't for a kid, isn't cheap and isn't for just dress up. It's a working watch ...Β MoreI have the grey version of this watch. I love to use it while outdoors or going hiking. It has the triple sensor on it. Temp, barometer, compass and altitude readings. It's powered by solar and can get a good 8 to 10 months easy on a little charge. I find it to be very trendy, nice and durable. Never had a single issue with it. It does take a minute to learn how to set it and the manual is pretty thick. I would recommend this watch for anyone who hikes, mountain climbs or like me to camp out ride a bike with. It's a solid watch that can take a beating! This is a HUGE watch, not big but huge. So if you have small wrists, this won't be a good fit. The dial is the solar panel. What it isn't: Isn't for a kid, isn't cheap and isn't for just dress up. It's a working watch with a solid performance. I want to say I paid anywhere from $350-400 a few years ago for it. It is a tad bigger than the Mud version. I have a watch collection of many types and this is my Hoss! I wear this also out in the weather since I'm a Storm Chaser, so it's pretty tough. πŸ˜‰ #Casio #ProTrek #watch #greatoutdoors #camping #hiking #mountainclimbing #travel #vacation #diving #sportswatch

A super accurate waterproof shockproof watch.
7 May 2020stevethier

originally posted on ebay.com

It automatically keeps exact time via GPS. It is shockproof and waterproof to 200m. It can give altitude, sunrise, sunset, tidal information and barometric pressure. It can be used to track my position via GPS as well as showing compass information. It has a rechargeable battery which can automatically be charged using built in solar panels which operate on any form of light. The battery can also be charged using a special battery charger provided with the watch.

Specification

Case size (L x W x H)46.9 x 49.6 x 12.9 mm
Case / bezel materialResin / Stainless steel
ConstructionShock Resistant, Carbon Core Guard structure
Water resistance200-meter water resistance
Surface treatmentBlack ion plated bezel

Price comparison

Updated 6 months ago
Please note: price history and price alerts are not available for some stores, including Amazon.com.au.
https://www.google.com/s2/favicons?domain=ebay.com.au&sz=64
eBay.com.au

$419.84

Casio Gst-b400 Watch

Free delivery

Affiliate Disclosure: We may receive a small commission for purchases made through this link at no extra cost to you. This helps support our site. Thank you!

https://www.google.com/s2/favicons?domain=monawatch.com&sz=64
Monawatch

$423.97

Out of stock

Casio G-Shock GST-B400AD-1A4 Red Dial Men’s Watch

Delivery $35.80

https://www.google.com/s2/favicons?domain=shiels.com.au&sz=64
Shiels

$523.00

Out of stock

G-Shock GSTB400AD-1A4 G-Steel - Shiels Jewellers

Free delivery

https://www.google.com/s2/favicons?domain=grahams.com.au&sz=64
Grahams Jewellers

$523.00

Out of stock

G-Shock GSTB400AD-1A4 G-Steel - Grahams Jewellers

Free delivery between 13–18 May

https://www.google.com/s2/favicons?domain=joom.com&sz=64
Joom

$546.00

CASIO Men Red Watch GST-B400AD-1A4 GST-B400AD-1A4 Random Watch Box

Delivery between 12–23 May $6

Price history

Price history

Please note: price history and price alerts are not available for some stores, including Amazon.com.au.

Reviews

16 November 2021

I am happy with the quality of the Casio GST-B400 red. Geniune watchbox. Only one problem with tax amount 21%, not explain during the process of the order. That means, the Creationwatch pricetax included is the same with french market. The difference is only the red color not available on european market. So I am happy. 5 stars for watch 3 stars for missing amount tax

originally posted on creationwatches.com
28 January 2020

I have the grey version of this watch. I love to use it while outdoors or going hiking. It has the triple sensor on it. Temp, barometer, compass and altitude readings. It's powered by solar and can get a good 8 to 10 months easy on a little charge. I find it to be very trendy, nice and durable. Never had a single issue with it. It does take a minute to learn how to set it and the manual is pretty thick. I would recommend this watch for anyone who hikes, mountain climbs or like me to camp out ride a bike with. It's a solid watch that can take a beating! This is a HUGE watch, not big but huge. So if you have small wrists, this won't be a good fit. The dial is the solar panel. What it isn't: Isn't for a kid, isn't cheap and isn't for just dress up. It's a working watch ...Β MoreI have the grey version of this watch. I love to use it while outdoors or going hiking. It has the triple sensor on it. Temp, barometer, compass and altitude readings. It's powered by solar and can get a good 8 to 10 months easy on a little charge. I find it to be very trendy, nice and durable. Never had a single issue with it. It does take a minute to learn how to set it and the manual is pretty thick. I would recommend this watch for anyone who hikes, mountain climbs or like me to camp out ride a bike with. It's a solid watch that can take a beating! This is a HUGE watch, not big but huge. So if you have small wrists, this won't be a good fit. The dial is the solar panel. What it isn't: Isn't for a kid, isn't cheap and isn't for just dress up. It's a working watch with a solid performance. I want to say I paid anywhere from $350-400 a few years ago for it. It is a tad bigger than the Mud version. I have a watch collection of many types and this is my Hoss! I wear this also out in the weather since I'm a Storm Chaser, so it's pretty tough. πŸ˜‰ #Casio #ProTrek #watch #greatoutdoors #camping #hiking #mountainclimbing #travel #vacation #diving #sportswatch

jenn.f originally posted on influenster.com
A super accurate waterproof shockproof watch.
7 May 2020

It automatically keeps exact time via GPS. It is shockproof and waterproof to 200m. It can give altitude, sunrise, sunset, tidal information and barometric pressure. It can be used to track my position via GPS as well as showing compass information. It has a rechargeable battery which can automatically be charged using built in solar panels which operate on any form of light. The battery can also be charged using a special battery charger provided with the watch.

stevethier originally posted on ebay.com
Almost perfect
4 April 2019

The watch is really nice, ultra light and the band is very comfortable. The band which is a woven fabric type is very comfortable. Barometer is very accurate and consistent. Temp and compass likewise. The only issue is the altimeter which does not work well. When I manually set the elevation for my location it will reflect even small changes in elevation like from the ground then raising to standing level however, within a short time, an hour or more it shows a skewed elevation often many times higher and at times showing below sea level. If not for that this watch would be virtually perfect. Casio website does mention that altitude needs to be reset. I didn't realize how often.

peterd1950 originally posted on ebay.com
As good as a pressure sensor watch gets
9 July 2015

I kind of look at every watch where the elevation is determined by pressure as more of a novelty; a toy to play with in the field. The only way you will ever get accurate elevation readings is with a gps. In fact, I checked this against my gps and found that after hiking up 2400 ft in elevation, the watch was off by 150 ft. If you're looking for a professional piece of equipment; something to survive off of, this is not the item. You will even find this disclaimer in the instruction manual. The watch has a ton of functions that are useable, including sunrise times. A lot of features that I will probably never use, but some might; what time it is in other time zones etc. As mentioned before, the altimeter will constantly be off and will need to be adjusted. The ...Β MoreI kind of look at every watch where the elevation is determined by pressure as more of a novelty; a toy to play with in the field. The only way you will ever get accurate elevation readings is with a gps. In fact, I checked this against my gps and found that after hiking up 2400 ft in elevation, the watch was off by 150 ft. If you're looking for a professional piece of equipment; something to survive off of, this is not the item. You will even find this disclaimer in the instruction manual. The watch has a ton of functions that are useable, including sunrise times. A lot of features that I will probably never use, but some might; what time it is in other time zones etc. As mentioned before, the altimeter will constantly be off and will need to be adjusted. The barometer works well. The temperature is not accurate unless you leave it off your wrist for a half hour or so (also noted in the manual). The compass (including the declination setting) is very accurate. The accumulated ascent and descent function on the trek logs is a nice function. It pretty much all boils down to this; As far as I'm concerned, a watch that measures altitude based on pressure is never going to be accurate. If accuracy is what you're looking for, you'll need to get a gps watch. But for the sake of having a nice tool to take out in the field to play with, this has got all the bells and whistles. I do enjoy playing with it.

Steven M originally posted on moosejaw.com
Camo watch
30 August 2021

Wanted a decent camo solar powerd watch for hunting season - this Casio came up as a really good choice - all tho I feel that after the200$ mark most watches are priced too high for the average consumer - retail was 280$ so I guess a little better of a deal at 255$ but I still think thats high fora niche market - the watch is pretty cool , band wearsalittle uncomfortable and I am hoping it breaks in after some more usage during the upcoming dove season. As far as the watch features -its pretty comparable to a suunto vector - takes a little while to figure out the steps to get to whatever application like the sunset/sunrise feature (important to know for hunting) - overall pretty happy with the watch so far. Bought the identical same watch for wife but in pink/black ...Β MoreWanted a decent camo solar powerd watch for hunting season - this Casio came up as a really good choice - all tho I feel that after the200$ mark most watches are priced too high for the average consumer - retail was 280$ so I guess a little better of a deal at 255$ but I still think thats high fora niche market - the watch is pretty cool , band wearsalittle uncomfortable and I am hoping it breaks in after some more usage during the upcoming dove season. As far as the watch features -its pretty comparable to a suunto vector - takes a little while to figure out the steps to get to whatever application like the sunset/sunrise feature (important to know for hunting) - overall pretty happy with the watch so far. Bought the identical same watch for wife but in pink/black and paid less than half which I thought was a really good deal (only 100$) and she loves it

the3fish originally posted on ebay.com
Great watch!
4 August 2021

Bought this for my daughter as her old G-Shock wasnt solar-powered and rather than just replace the battery, I wanted to replace it with something that wouldnt need another battery changefor a very, very, very long time! She loves the watch! Its very comfortable and both my wife and I think its super cute! Nice to see my daughter loving her Casios as much as I did when I was her age.

ipaidforthis originally posted on ebay.com
Great watch, strap design not for the hairy
20 January 2021

Great watch, looks great and is built well. Built in functions are good and are reasonably easy to use. Plastic buttons feel a touch cheap but can be overlooked for how light this watch is. There is a single huge flaw with this watch - having arm hair. There are tabs on the band that catch arm hair between the strap and watch every time the watch moves, so after day 1 it had removed half of the hair on my wrist. A few minutes with a Dremel and that issue was solved, I'm sure sandpaper or a file could achieve the same effect with a bit more elbow grease involved. Not sure what they were thinking with that bit of design, obviously didn't test it with us moderately hairy folk. I've attached a picture of my bands post-hair-compatibility-upgrade.

quantum_guy originally posted on ebay.com
Review Title
20 September 2020

First class service from first class watches. 2nd watch I have purchased, the first for my sons 16th and now a top up present for his 21st. Gone with GShock both times due to their hard wearing quality and active life style my son has. The first is still going strong but wanted something different so went for G-Shock | G-Steel | Bluetooth | Chronograph | Blue | GST-B100G-2AER. Amazing service, ordered it on Friday morning and received it Saturday morning the next day, I was kept up to speed from Royal mail all the way through. I have never purchased something so easily, very impressed and highly recommend First Class Watches.

originally posted on firstclasswatches.co.uk
Worth the wait. Expensive but feature rich.
25 March 2018

Got this watch as a JDM purchase before the American and possibly global release. This was on my purchase list since the first rumours were out. I have a lot of premium gshock and I love collecting them and wearing them. This Is a great looking addition to my stable. It's expensive but offers a new interface and new feature set. Only compliant so far is that for a GPS watch there is no quick fix for GPS signal like other GPS watches form Garmin and Suunto. The satellite acquisition time is a bit long at over 1min but that's annoying but not a deal breaker. The design is bold and unapologetically G shock. I am loving it.

sap26au originally posted on ebay.com

Specification

Case size (L x W x H)46.9 x 49.6 x 12.9 mm
Case / bezel materialResin / Stainless steel
ConstructionShock Resistant, Carbon Core Guard structure
Water resistance200-meter water resistance
Surface treatmentBlack ion plated bezel

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