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Seiko Prospex Solar GMT Diver

Men's

RM185

RM1230

SFK003J1

Specifications

Movement

Calibre Type

Quartz Solar

Precision

-15/+15 seconds per month

Calibre Number

5K65

Functions

24-hour hand, Calendar-linked time difference adjustment function, Date display, Overcharge prevention function, Quick-start function

Other Details

Magnetic Resistance

4,800 A/m

Weight

163 g

Features

Rotating compass bezel
Screw-down crown
Screw case back

Water Resistance

20 bar

Clasp

Three-fold clasp with secure lock & push button release, solid & slide adjuster

Case/Band

Case Material

Stainless steel

Crystal

Sapphire crystal

Crystal Coating

Super-clear coating

Case Size

Case Diameter: 45.0 mm
Case Thickness: 13.2 mm
Case Length (Lug to Lug): 51.8 mm
Lug Width: 20.0 mm

Distance between lugs

20

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Committed to Excellence

Seiko Prospex introduces its first solar-powered watch equipped with a GMT hand, driven by the in-house developed calibre 5K62.

The watch design is affectionately known as the “Sumo” by Seiko enthusiasts, thanks to its substantial case, distinctive shape, and bold 12 o’clock marker—delivering a strong and masculine presence on the wrist.

The orange GMT hand, coated with Lumibrite, ensures excellent visibility even underwater, while the deep green dial with a subtle gradient effect adds depth and a striking visual appeal.

With 200-meter water resistance, a robust stainless steel case, and high-efficiency power generation, this timepiece combines durability with a bold, sporty character.

Prospex is a combination of the words “Professional” and “Specifications” Seiko Prospex watches are built for reliability, durability, and performance—ideal for sports and adventure in demanding environments.

The Sumo Solar GMT continues this legacy with a bold diver design, 200-meter water resistance, and a high-efficiency solar movement, delivering both functionality and strong visual appeal.

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Seiko Prospex Solar GMT Diver

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Seiko Prospex Solar GMT Diver

Men's

Spring 2026 Limited Edition