Seiko Prospex King Sumo Analog Watch SPB321J1

The Seiko Prospex 'Sumo' is a robust men's dive watch, affectionately nicknamed by Seiko enthusiasts for its distinctive case shape, bold proportions, and unique 12 o'clock marker. This updated version features a striking blue dial with a finely pressed gradient pattern, complemented by a durable ceramic bezel and a super-hard coating on the stainless steel case and bracelet for enhanced scratch resistance. A redesigned three-row bracelet and modernized clasp provide improved comfort and a secure fit, making it ideal for both everyday wear and underwater adventures.

Powered by the Seiko 6R35 automatic movement with manual winding capability, the watch delivers reliable performance with an impressive 70-hour power reserve and an accuracy of -15 to +25 seconds per day. As part of the Prospex collection—short for "Professional Specifications"—it is built to withstand demanding environments, reflecting Seiko's long-standing expertise in dive watch innovation since introducing Japan's first diver's watch in 1965.