This watch shape is affectionately named ‘Sumo’ by Seiko fans because of its size and shape and the 12 o’clock marker - it’s a substantially strong looking timepiece. This latest design has been upgraded with new modern features, including a ceramic bezel and super hard coating on the case and bracelet for durability. A new 3 row bracelet has been specifically made for this model, while the clasp has also been upgraded. The dial features a fine pressed pattern dial with gradations of blue. Prospex is a combination of the words 'Professional' and 'Specifications.' Seiko Prospex timepieces are designed to be practical, reliable and durable; to meet the high standards required in extreme environments for sports lovers and adventure seekers alike. Since launching Japan’s first diver’s watch in 1965, Seiko’s innovative watchmaking has changed global dive watch standards.
This watch shape is affectionately named ‘Sumo’ by Seiko fans because of its size and shape and the 12 o’clock marker - it’s a substantially strong looking timepiece. This latest design has been upgraded with new modern features, including a ceramic bezel and super hard coating on the case and bracelet for durability. A new 3 row bracelet has been specifically made for this model, while the clasp has also been upgraded. The dial features a fine pressed pattern dial with gradations of blue. Prospex is a combination of the words 'Professional' and 'Specifications.' Seiko Prospex timepieces are designed to be practical, reliable and durable; to meet the high standards required in extreme environments for sports lovers and adventure seekers alike. Since launching Japan’s first diver’s watch in 1965, Seiko’s innovative watchmaking has changed global dive watch standards.
in 2 offers
The lowest price for Seiko SPB321J Prospex King Sumo Divers Watch right now is $1,715.67 at Helvetic Time, compared across 2 retailers.
The all-time low was $911.20 on 13 Mar 2025 — today's price is 88% above the lowest ever. It has been notably cheaper before — worth setting a price alert.
Prices last updated 21 Sept 2026.
Seiko SPB321J Prospex King Sumo Divers Watch
This watch shape is affectionately named ‘Sumo’ by Seiko fans because of its size and shape and the 12 o’clock marker - it’s a substantially strong looking timepiece. This latest design has been upgraded with new modern features, including a ceramic bezel and super hard coating on the case and bracelet for durability. A new 3 row bracelet has been specifically made for this model, while the clasp has also been upgraded. The dial features a fine pressed pattern dial with gradations of blue. Prospex is a combination of the words 'Professional' and 'Specifications.' Seiko Prospex timepieces are designed to be practical, reliable and durable; to meet the high standards required in extreme environments for sports lovers and adventure seekers alike. Since launching Japan’s first diver’s watch in 1965, Seiko’s innovative watchmaking has changed global dive watch standards.
This watch shape is affectionately named ‘Sumo’ by Seiko fans because of its size and shape and the 12 o’clock marker - it’s a substantially strong looking timepiece. This latest design has been upgraded with new modern features, including a ceramic bezel and super hard coating on the case and bracelet for durability. A new 3 row bracelet has been specifically made for this model, while the clasp has also been upgraded. The dial features a fine pressed pattern dial with gradations of blue. Prospex is a combination of the words 'Professional' and 'Specifications.' Seiko Prospex timepieces are designed to be practical, reliable and durable; to meet the high standards required in extreme environments for sports lovers and adventure seekers alike. Since launching Japan’s first diver’s watch in 1965, Seiko’s innovative watchmaking has changed global dive watch standards.
Last updated at 21/09/2026 01:37:16
Seiko Men's SPB321J1 Prospex Diver's Auto Watch
Delivery $30.61
Seiko Prospex SPB323J1 Steel Brown 45mm 2026
Delivery $48
originally posted on wallacebishop.com.au
Watch is stunning. Dial wave texture is subtle but effective. A heavyweight Sumo with a few welcome upgrades. And it's officially a diver.
| Diameter | 45 mm |
| Water Resistance | 20 Bar (Dive) |
| Time | hours - Analogue hand |
| Calendar | Date - Window |
| Year | 2022 Fall / Winter |
Seiko Men's SPB321J1 Prospex Diver's Auto Watch
Delivery $30.61
Seiko Prospex SPB323J1 Steel Brown 45mm 2026
Delivery $48
Watch is stunning. Dial wave texture is subtle but effective. A heavyweight Sumo with a few welcome upgrades. And it's officially a diver.
| Diameter | 45 mm |
| Water Resistance | 20 Bar (Dive) |
| Time | hours - Analogue hand |
| Calendar | Date - Window |
| Year | 2022 Fall / Winter |
