SEIKO PROSPEX SPB433J1 BLACK SERIES SUMO DIVER LIMITED EDITION MEN WATCH

Seiko Prospex SPB433J1 — The Black Series Limited Edition Diver's Watch

The Seiko Prospex SPB433J1 is "The Black Series" — a committed all-black execution of the Sumo diver's case shape, limited to 3,500 pieces worldwide. Every element has been rendered in black: the hardcoated stainless steel case, the ceramic unidirectional rotating bezel, the dial, and the stainless steel bracelet. The result is a dive watch that approaches stealth in its visual character — no contrast, no colour break, no relief — until the Lumibrite engages in low light and the design fully reveals itself as a professional diver's instrument.

Powered by the in-house 6R35 automatic calibre with hand-winding capability and a 70-hour power reserve, the SPB433J1 is mechanically dependable and purposefully specified. The sapphire crystal protects the black dial through active use, and the Diver's 200M water resistance with screw-down crown means it is genuinely ready for the water. At 45mm and 13.4mm, this is a substantial watch — the Sumo case shape is known for its commanding wrist presence, and the all-black execution amplifies that presence considerably. Presented with a special edition box, it is as considered in its packaging as it is in its design.

Key Features

• Seiko 6R35 automatic movement with manual winding — self-winding with the convenience of hand-winding when needed
• Approx. 70-hour power reserve — dependable performance through extended daily wear
• Accuracy: +25/-15 seconds per day — reliable automatic timekeeping
• Diver's 200M water resistance — built for recreational diving and water sports
• All-black execution — hardcoated case, ceramic bezel, black dial, and black stainless steel bracelet throughout
• Black ceramic unidirectional rotating bezel — scratch-resistant, precise, and purpose-built for dive timing
• Black dial with baton markers — total tonal coherence from bezel to bracelet
• Lumibrite on hands and hour markers — the design fully reveals in low light and underwater conditions
• Sapphire crystal — premium scratch resistance and superior optical clarity
• 45mm stainless steel case with hardcoating — commanding Sumo proportions at 13.4mm profile
• Screw-down crown — water integrity protection for diving use
• Black stainless steel bracelet — all-black aesthetic completed from case to clasp
• Special edition box — presentation-ready from the moment it arrives
• Limited to 3,500 pieces worldwide — confirmed scarce

Why You'll Love It

The SPB433J1 is for the collector who wants the Sumo case shape in its most considered and uncompromising expression. "The Black Series" is not a colourway — it is a design decision that removes every element of contrast and hierarchy from the watch, leaving only the form and the function. The 45mm Sumo case is one of the most distinctive silhouettes in the Prospex diver lineup, and the all-black treatment transforms it from bold to severe. The ceramic bezel is virtually unscratchable through daily use, the sapphire crystal keeps the dial pristine, and the 70-hour power reserve handles any extended weekend. At 3,500 pieces worldwide, this is a limited edition that is genuinely limited — and the special box marks it clearly as a collector's piece.

About the Seiko Prospex Sumo

The "Sumo" nickname — so widely used among Seiko collectors that it functions as the model's common name — refers to the distinctive case shape first introduced in the Prospex diver lineup: wide, substantial, with a strong visual mass that references the solidity of a sumo wrestler's stance. The case shape has earned a devoted following for its combination of bold proportions and exceptional wrist comfort, and has become one of the most recognisable silhouettes in the Seiko Prospex family. The SPB433J1 brings that design to its logical extreme — all-black, limited, and unequivocal.

The Seiko Prospex Story

Prospex is a combination of the words "Professional" and "Specifications." Seiko Prospex timepieces are designed to be practical, reliable, and durable — built to meet the high standards required in extreme environments for sports lovers and adventure seekers alike. The story begins in 1881, when Kintaro Hattori founded a clock and watch shop in Ginza, Tokyo — the business that would become the Seiko of today. Since 1965, when Seiko created Japan's first diver's watch, the Prospex dive line has stood for underwater precision and reliability. The SPB433J1 carries that legacy forward in its most visually radical limited edition expression.

Backed by Seiko's official warranty. Authentic Seiko Prospex watch, sold by authorised retailer City Chain Singapore.

Explore the full Seiko Prospex Collection or browse all Seiko watches at City Chain Singapore.