Prospex Blue Dial 45MM Diver "King Sumo" Automatic SPB321

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 grey.

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.

Specifications

Movement

• Caliber Number: 6R35
• Movement Type: Automatic with manual winding
• Accuracy: +25 to -15 seconds per day
• Duration: Approx. 70 hours
• Jewels: 24

Functions

• Stop seconds hand function
• Date display

Case Size

Thickness: 13.4mm
Diameter: 45.0mm
Lug-to-lug: 52.6mm
Weight: 190.0
Lug width: 20

• Case Material: Stainless steel (super hard coating)
• Crystal: Sapphire crystal
• Crystal Coating: Anti-reflective coating on inner surface
• LumiBrite: LumiBrite on hands, index(es) and bezel
• Clasp: Three-fold clasp with secure lock , push button release with extender

Features

• Screw case back
• Unidirectional rotating bezel
• Screw-down crown
• Three-fold clasp with secure lock
• Water Resistance: 200m / 660ft diver's