Casio Watch G-Shock Gma-s2100-1aer - Casio
The Casio GM-2100-1A G-Shock Metal Covered wristwatch combines a stainless steel case with a durable black plastic strap, offering a resilient men's watch. It features an analog-digital display with a gray dial, luminous hands and indices for better visibility in low light conditions, as well as a mineral glass for scratch resistance. Key functions include world time, a 1/100-second stopwatch, countdown timer, fully automatic calendar with day and date display, hourly time signal, and dual LED lighting. With a water resistance of 200 meters, it is suitable for swimming and snorkeling. The case measures approximately 44 mm in diameter and 12 mm in thickness, with a band width of 16 mm, and features a screw-down case back and a pin buckle for secure comfort. This model emphasizes reliability and practicality under demanding conditions.
The Casio GM-2100-1A G-Shock Metal Covered wristwatch combines a stainless steel case with a durable black plastic strap, offering a resilient men's watch. It features an analog-digital display with a gray dial, luminous hands and indices for better visibility in low light conditions, as well as a mineral glass for scratch resistance. Key functions include world time, a 1/100-second stopwatch, countdown timer, fully automatic calendar with day and date display, hourly time signal, and dual LED lighting. With a water resistance of 200 meters, it is suitable for swimming and snorkeling. The case measures approximately 44 mm in diameter and 12 mm in thickness, with a band width of 16 mm, and features a screw-down case back and a pin buckle for secure comfort. This model emphasizes reliability and practicality under demanding conditions.
The Casio GM-2100-1A G-Shock Metal Covered wristwatch combines a stainless steel case with a durable black plastic strap, offering a resilient men's watch. It features an analog-digital display with a gray dial, luminous hands and indices for better visibility in low light conditions, as well as a mineral glass for scratch resistance. Key functions include world time, a 1/100-second stopwatch, countdown timer, fully automatic calendar with day and date display, hourly time signal, and dual LED lighting. With a water resistance of 200 meters, it is suitable for swimming and snorkeling. The case measures approximately 44 mm in diameter and 12 mm in thickness, with a band width of 16 mm, and features a screw-down case back and a pin buckle for secure comfort. This model emphasizes reliability and practicality under demanding conditions.
The Casio GM-2100-1A G-Shock Metal Covered wristwatch combines a stainless steel case with a durable black plastic strap, offering a resilient men's watch. It features an analog-digital display with a gray dial, luminous hands and indices for better visibility in low light conditions, as well as a mineral glass for scratch resistance. Key functions include world time, a 1/100-second stopwatch, countdown timer, fully automatic calendar with day and date display, hourly time signal, and dual LED lighting. With a water resistance of 200 meters, it is suitable for swimming and snorkeling. The case measures approximately 44 mm in diameter and 12 mm in thickness, with a band width of 16 mm, and features a screw-down case back and a pin buckle for secure comfort. This model emphasizes reliability and practicality under demanding conditions.
in 49 offers
The lowest price for Casio Watch G-Shock Gma-s2100-1aer - Casio right now is $115.36 at Dokodemo, compared across 29 retailers.
The all-time low was $99.00 on 26 Jan 2026 — today's price is 17% above the lowest ever. That's a little above the best price we've seen.
Prices last updated 24 Aug 2026.
Last updated at 24/08/2026 10:30:39
Casio GMA-S2100-7AJF
Delivery between 29 Aug – 4 Sept $33.10
CASIO G-SHOCK オクタゴンデザイン GMA-S2100-1A メンズ レディース [並行輸入品]
Delivery $38.78
[カシオ] 腕時計 ジーショック 【国内正規品】ミッドサイズモデル GMA-S2100-7AJF レディース ホワイト
Delivery $38.78
Casio G-Shock GMA-S2100-1AJF Plastic Black 46mm
Delivery $43
Casio G-Shock GMA-S2100-1AER Black 43mm
Delivery $67
Casio G-Shock GMA-S2100-1AER Plastic Black 42.9mm
Delivery $82
Casio G-Shock Black Dial Women 42.9mm G1107 GMA-S2100-1A
Delivery $0.29
Casio G-Shock "Mini CasiOak GMA-S2100-1A
Delivery $34.95
Casio G-Shock "Mini CasiOak GMA-S2100-4A
Delivery $34.95
CASIO GMA-S2100-7AJF G-Shock Unisex GA-2100 MID White Rub | IPPO Japan
Delivery $48.48
originally posted on g-shock.co.uk
It's a clever little analogue/digital watch with good looks. The sunburst dial comes to life in the sun - which surprised me! Brilliant yellow resin is refreshing but the material is not as supple as the usual Casio black resin bands - I guess it's the nature of the coloured material that is used. A little larger on the wrist than say, the 5600/5000 resin or 'full-metal squares', but its lightness makes up for this.Usual casio functionality, which is just great fun especially when watching the hands spin. Lots to learn - features, functions, connectivity! The watch automatically changed to BST at the weekend - a result of the automatic time adjustment (I'm guessing), and the watch being in close proximity to my mobile. However, I'd still prefer Multiband ... MoreIt's a clever little analogue/digital watch with good looks. The sunburst dial comes to life in the sun - which surprised me! Brilliant yellow resin is refreshing but the material is not as supple as the usual Casio black resin bands - I guess it's the nature of the coloured material that is used. A little larger on the wrist than say, the 5600/5000 resin or 'full-metal squares', but its lightness makes up for this.Usual casio functionality, which is just great fun especially when watching the hands spin. Lots to learn - features, functions, connectivity! The watch automatically changed to BST at the weekend - a result of the automatic time adjustment (I'm guessing), and the watch being in close proximity to my mobile. However, I'd still prefer Multiband functionality cos I'm an older codger and unsure of all this 'connected living'!It's staying in my collection of Tough Solar, Multiband resin and full-metal Casios despite this bluetooth time adjustmant thingummyjig! I may just add the metal version - if it's not too large on the wrist.
originally posted on g-shock.co.uk
The yellow colour wasnt my first choice for a watch but I soon realised that this one had the perfect easy to read dials, the other four variants in this range were really hard to read so I decied to give this a go.Arrived the next following day after placing my order with G-Shock, I tried it on and wow it fits perfectly on the wrist. Its nice and light for everyday wear and tear having 200m water resistance. This has tough solar power and you dont have to rely on changing the batteries on this watch. Also you can connect this with your phone and adjust the settings of the watch, also this can be used to find your phone! The design is classic and this is one of G shocks god tier watches that everyone should own. I would love it if they could keep the design but ... MoreThe yellow colour wasnt my first choice for a watch but I soon realised that this one had the perfect easy to read dials, the other four variants in this range were really hard to read so I decied to give this a go.Arrived the next following day after placing my order with G-Shock, I tried it on and wow it fits perfectly on the wrist. Its nice and light for everyday wear and tear having 200m water resistance. This has tough solar power and you dont have to rely on changing the batteries on this watch. Also you can connect this with your phone and adjust the settings of the watch, also this can be used to find your phone! The design is classic and this is one of G shocks god tier watches that everyone should own. I would love it if they could keep the design but make the watch smaller for people with skinny wrists.Overall this Banana watch is awesome!
originally posted on g-shock.co.uk
Found watch overly complicated to actually set the time initially. The digital screen is tiny and the process complicated and long winded (mine needed resetting because of magnetic interference or jarring during transit). As a result I've not bothered with any other functions. Not at all user friendly.That said, now the time and date have been set I absolutely love the thing. Light, comfortable and looks amazing.Overall as much as I love the look and feel, and as much as the ruggedness of it might be a plus, I'm not sure I'd buy another one, simply because of the hassle setting the thing up.
| Diameter | 42.9 mm |
| Water Resistance | 20 Bar (Dive) |
| Time | hours - Analogue hand |
| Calendar | Date - Digital |
| Chronograph and timers | Stopwatch /Chronograph - 1/100 seconds 24 hours |
Casio GMA-S2100-7AJF
Delivery between 29 Aug – 4 Sept $33.10
CASIO G-SHOCK オクタゴンデザイン GMA-S2100-1A メンズ レディース [並行輸入品]
Delivery $38.78
[カシオ] 腕時計 ジーショック 【国内正規品】ミッドサイズモデル GMA-S2100-7AJF レディース ホワイト
Delivery $38.78
Casio G-Shock GMA-S2100-1AJF Plastic Black 46mm
Delivery $43
Casio G-Shock GMA-S2100-1AER Black 43mm
Delivery $67
It's a clever little analogue/digital watch with good looks. The sunburst dial comes to life in the sun - which surprised me! Brilliant yellow resin is refreshing but the material is not as supple as the usual Casio black resin bands - I guess it's the nature of the coloured material that is used. A little larger on the wrist than say, the 5600/5000 resin or 'full-metal squares', but its lightness makes up for this.Usual casio functionality, which is just great fun especially when watching the hands spin. Lots to learn - features, functions, connectivity! The watch automatically changed to BST at the weekend - a result of the automatic time adjustment (I'm guessing), and the watch being in close proximity to my mobile. However, I'd still prefer Multiband ... MoreIt's a clever little analogue/digital watch with good looks. The sunburst dial comes to life in the sun - which surprised me! Brilliant yellow resin is refreshing but the material is not as supple as the usual Casio black resin bands - I guess it's the nature of the coloured material that is used. A little larger on the wrist than say, the 5600/5000 resin or 'full-metal squares', but its lightness makes up for this.Usual casio functionality, which is just great fun especially when watching the hands spin. Lots to learn - features, functions, connectivity! The watch automatically changed to BST at the weekend - a result of the automatic time adjustment (I'm guessing), and the watch being in close proximity to my mobile. However, I'd still prefer Multiband functionality cos I'm an older codger and unsure of all this 'connected living'!It's staying in my collection of Tough Solar, Multiband resin and full-metal Casios despite this bluetooth time adjustmant thingummyjig! I may just add the metal version - if it's not too large on the wrist.
The yellow colour wasnt my first choice for a watch but I soon realised that this one had the perfect easy to read dials, the other four variants in this range were really hard to read so I decied to give this a go.Arrived the next following day after placing my order with G-Shock, I tried it on and wow it fits perfectly on the wrist. Its nice and light for everyday wear and tear having 200m water resistance. This has tough solar power and you dont have to rely on changing the batteries on this watch. Also you can connect this with your phone and adjust the settings of the watch, also this can be used to find your phone! The design is classic and this is one of G shocks god tier watches that everyone should own. I would love it if they could keep the design but ... MoreThe yellow colour wasnt my first choice for a watch but I soon realised that this one had the perfect easy to read dials, the other four variants in this range were really hard to read so I decied to give this a go.Arrived the next following day after placing my order with G-Shock, I tried it on and wow it fits perfectly on the wrist. Its nice and light for everyday wear and tear having 200m water resistance. This has tough solar power and you dont have to rely on changing the batteries on this watch. Also you can connect this with your phone and adjust the settings of the watch, also this can be used to find your phone! The design is classic and this is one of G shocks god tier watches that everyone should own. I would love it if they could keep the design but make the watch smaller for people with skinny wrists.Overall this Banana watch is awesome!
Found watch overly complicated to actually set the time initially. The digital screen is tiny and the process complicated and long winded (mine needed resetting because of magnetic interference or jarring during transit). As a result I've not bothered with any other functions. Not at all user friendly.That said, now the time and date have been set I absolutely love the thing. Light, comfortable and looks amazing.Overall as much as I love the look and feel, and as much as the ruggedness of it might be a plus, I'm not sure I'd buy another one, simply because of the hassle setting the thing up.
Great watch, love the Bluetooth feature. It doesn't do calls etc but once connected to your phone, you can adjust time etc from the app which is good. The weight and materials are as expected, nothing special but usually durable. Expected more as it was a deadpool edition ie a little engraved logo or any other logo on the watch but it doesn't have any distinguishing features related to deadpool. Usual functions as expected. All round good watch but not a stand out version.
I wanted a watch that I could do DIY in and not worry about it getting trashed. I definitely found the right one. The looks are amazing with the bright yellow sticking out very well indeed. It is incredibly light but with the impact gubbins inside I’m sure its lightness has no bearing on its quality. The buckle? I’m not sure. Only time will tell. The only thing that is a slight let down and hence the 4 stars is that the second, date and month numbers are dark and not easy to read. Apart from that the dial is very readable and a pleasure to look at. When I ordered my watch I was amazed at the level of service I received as the watch actually arrived before it should have. I love my watches and this one has not let me down in looks, durability and overall wearability. ... MoreI wanted a watch that I could do DIY in and not worry about it getting trashed. I definitely found the right one. The looks are amazing with the bright yellow sticking out very well indeed. It is incredibly light but with the impact gubbins inside I’m sure its lightness has no bearing on its quality. The buckle? I’m not sure. Only time will tell. The only thing that is a slight let down and hence the 4 stars is that the second, date and month numbers are dark and not easy to read. Apart from that the dial is very readable and a pleasure to look at. When I ordered my watch I was amazed at the level of service I received as the watch actually arrived before it should have. I love my watches and this one has not let me down in looks, durability and overall wearability. Would I get another? Probably. The thing is whilst this one is doing a great job I don’t see a point in replacing. It’s awesome. If you’re wondering about getting one then I’d say. Definitely.
Nice special Deadpool edition watch. Auto time set by zone, not too hard to navigate. Even though I knew it didn't have a date function, this would of been nice. It has two wats of time shown, one with the standard sword hands and the other is the digital time . The Bluetooth function is useless really, its only function is to find your phone with a small sounding beep. But this is all I need, I don't need a crazy modern digital watch to read messages and to constantly charge ect. This is simple, works and changes in the sun. It needs half a day's worth of dire t sunlight to charge, at least once a month. However, other light sources can work (so I'm led to believe).
Everything you can expect of a g-shock: sturdy and tough.Pros:- The red accents look great- Tough- Solar poweredCons:- It's actually pretty difficult to see the dial in dark environments (but it does have an LED)- Sure it's tough, but the lens is a mineral crystal which is a scratch magnet- This could be my individual experience, but it took a very long time to charge to "H" level. I'm talking about 10 hours in direct sunlight.Really, in the end, watches are a subjective preference, and this one wasn't for me. However, if g-shock is your style, this watch is pretty good at the price point.
Casio Men's Bluetooth G-Shock Green Solar Power Watch With Resin StrapVery happy with my purchase. The item was at a good price and received a further discount with code. There were no issues placing the order and received regular updates on the order status.Despite placing my order fairly late in the day, the item was dispatched and I received it the next day. Extremely well packed and have had no issues with the watch. I've only just received the item so can't comment on warranty, returns etc but my experience has been 100% positive.As for the watch itself. I purchased it to replace my older (non solar) model. Very happy with the appearance. Setup was simple. I downloaded the app, paired the device via Bluetooth and applied all my settings/preferences. ... MoreCasio Men's Bluetooth G-Shock Green Solar Power Watch With Resin StrapVery happy with my purchase. The item was at a good price and received a further discount with code. There were no issues placing the order and received regular updates on the order status.Despite placing my order fairly late in the day, the item was dispatched and I received it the next day. Extremely well packed and have had no issues with the watch. I've only just received the item so can't comment on warranty, returns etc but my experience has been 100% positive.As for the watch itself. I purchased it to replace my older (non solar) model. Very happy with the appearance. Setup was simple. I downloaded the app, paired the device via Bluetooth and applied all my settings/preferences. Initially the charge stayed at around Medium but, after wearing it outside for a full day the charge has reached High level and has remained so.Many Thanks
The bright yellow color stands out, although it tends to show stains easily, which can be a minor inconvenience. Despite this, the watch performs exceptionally well. It has a great light feature that ensures visibility in low-light conditions and maintains accurate time. Overall, it's a reliable and stylish watch.
| Diameter | 42.9 mm |
| Water Resistance | 20 Bar (Dive) |
| Time | hours - Analogue hand |
| Calendar | Date - Digital |
| Chronograph and timers | Stopwatch /Chronograph - 1/100 seconds 24 hours |
