4 Solar-Powered GMT from the Seiko Prospex 'SUMO' Family

Seiko Prospex has unveiled its inaugural solar-powered watch featuring a GMT hand, the Seiko Prospex "Sumo" Solar GMT watches. Seiko watch lovers will love this new collection, as this is a watch designed for the adventurous and active lifestyle.

Introducing all four models, the Seiko SFK Series and Japan domestic market models SBPK
•    Blue SFK001
•    Green SFK003 / (SBPK001 JDM)
•    Black (SBPK003 JDM)
•    Pepsi (SBPK005 JDM)

2023 Seiko Prospex Sumo Solar GMT all 4 models, from left : Black (SBPK003 JDM) , Green SFK003 / (SBPK001 JDM), Blue SFK001 and Pepsi (SBPK005 JDM)

Each of the Solar Sumo dials adds a vibrant color touch to the intricately embossed pattern design. They offer maximum comfort, superior water resistance, and accurate quartz movement for excellent timekeeping. This new Seiko Prospex "Sumo" Solar GMT collection of watches is made from superior materials, crafted with precision, and engineered for durability.

The Seiko Prospex Solar Sumo GMT are exciting and unexpected watches, featuring the classic and beloved Sumo case, dial makers design and 20mm watch lug(however, their watch bands are not compatible). The watch comes with 45mm steel cases and features 200 meters of water resistance. A sapphire crystal with an inner AR treatment, and Seiko's LumiBrite treatment for the hands and markers. The GMT function is subtly integrated into the dial with an orange or red GMT element and a date aperture at three o'clock. Additionally, the 5k65 movement is a solar-powered quartz movement that has a power reserve of up to nine months and an accuracy of +/- 15 seconds a month and is equipped with a GMT function for keeping track of two time zones at once.

This watch is perfect for any underwater activity, and its accurate and reliable timekeeping and Lumibrite hands and markers make it an ideal choice for anyone looking for a reliable dive watch that is stylish and functional. This model is designed for extreme sports and activities that require the utmost accuracy and reliability. It is an ideal choice for anyone looking for a watch that can withstand the rigors of extreme water sports and diving without sacrificing precision or style.

Specifications

• Caliber Number: 5K65
• Movement Type: Solar (quartz)
• Precision: ±15 seconds per month
• Overcharge prevention function
• Quick-start function
• Water Resistance: 200m / 660ft
• Magnetic Resistance: 4,800 A/m
• Weight: 182g

Watch Case

• Material: Stainless steel
• Size: Thickness:13.2mm, Diameter:45.0mm, Lug-to-lug:51.8mm
• Crystal: Sapphire crystal
• Crystal Coating: Anti-reflective coating on the inner surface
• Unidirectional rotating bezel
• Screw-down crown  

Watch Dial

• LumiBrite: LumiBrite on hands, index(es), and bezel
• 24-hour hand
• Date display

Watch Band

• Material: Stainless steel
• Length: 200mm
• Watch lug: 20mm   
• Clasp : Three-fold clasp with secure lock, push button release with extender

The Seiko SUMO watch bands

Seiko Sumo Automatic Watches powered by the 6R15 movement
SBDC001, SBDC003, SBDC005, SBDC017, SBDC019, SBDC027, SBDC031, SBDC033, SBDC049, SBDC057, SBDC069, SPB029, SPB031, Zimbe Limited Edition SPB055, SZSC004

Seiko Sumo Automatic Watches powered by the 6R35 movement.
SBDC081, SBDC083,   SBDC095, SBDC097, SBDC099, SBDC113, SBDC114, SBDC121, Black Sumo SPB125, SPB175, SPB177, SPB179, ROOTBEER Limited Edition SPB192, Zimbe Limited Edition SPB194, SPB195, SPB103

With nearly 30 watch band options for the Seiko Sumo Automatic, VIEW all

At Strapcode, you can find the MiLTAT's hottest stainless steel metal watch bands with various metal finishes. Also, Crafter Blue's rubber straps both are custom-made to fit Seiko Sumo Automatic. These watch bands are designed to upgrade your watch and can be easily installed on the Seiko Sumo watch. The metal finishes range from brushed and polished finishes to gold, and DLC black finishes, giving you a variety of options to choose from. The rubber straps are comfortable and secure and come in various colors and styles. So you can simply give your Seiko Sumo watch a unique and stylish look that will last long.

With nearly 30 watch band options for the Seiko Sumo, changing your watch band to match your outfit is both flexible and fun. With a wide range of styles and materials to choose from, you can find the perfect watch band for any occasion. Whether you're looking for a classic stainless steel look or something more daring, like a rubber strap or canvas watch band, you'll be sure to find something to match your style.

Can the fitted end-link watch band of the Seiko Sumo Automatic be used with this Solar Sumo GMT?

Comparing the watch bands of the Seiko SPB103J1 Sumo Automatic and the Solar-Powered Sumo GMT Divers, the new Solar Sumo GMT has "814" on the endlink, while the Sumo SPB103J1 automatic has "611". Upon testing, unfortunately, we found that it cannot be fitted onto the bands of the Sumo Automatic Watch.

Comparing the Case Back of the Seiko Sumo powered by the 6R35 automatic movement (left) and the Solar SUMO GMT driven by the 5K65 caliber (right).

Is the Seiko Sumo Automatic Watch Band Compatible with the Seiko Prospex Sumo Solar Chronograph SSC757J1 and SSC807J1?

The Seiko Sumo Chronographs SSC757 and SSC807, which are powered by Solar movement, have a similar look to the Sumo Automatic; however, their watch cases have a slightly different design that is not compatible with our fitted end link. But don't despair, as Strapcode always has something to inspire you with our wide selection of watch bands in a variety of styles and materials.

Seiko Sumo Solar Chronograph SSC807 has a timeless young look, with a sporty emphasis, thanks to the Rollball stainless steel watch band.

External References

• Seiko Prospex Seascape ‘SUMO’ Solar GMT Diver
• Seiko Introduces The New Prospex SFK001J1 And SFK003J1 - Two Solar-Powered Quartz GMT Versions Of Its Famous Sumo Dive Watch

Written by Vienna.C., images by Toni and others as noted