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The Seiko Prospex SPB451 is a 2024 reinterpretation of the 1965 62MAS, Japan's first diver's watch. It pairs a 40mm stainless steel case with a deep blue dial, LumiBrite markers and hands, a unidirectional timing bezel, a date between 4 and 5 o'clock, and curved sapphire crystal with anti-reflective coating. It suits buyers who want vintage dive styling in a modern, wearable automatic. Against the original 62MAS it adds sapphire, better water resistance and a more compact case; against Seiko's own 200m Prospex divers it trades some depth rating for heritage looks and everyday size.
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The Seiko Prospex SPB451 is an automatic diver's watch inspired by Seiko's first diver's watch, the 1965 62MAS. It has a 40mm stainless steel case, a deep blue dial and a stainless steel bracelet. It was introduced in 2024 as a reinterpretation of the original design with updated materials and improved water resistance.
The dial has rectangular hour markers and broad hands coated with LumiBrite for low-light visibility. The date window sits between 4 and 5 o'clock, so all 12 hour markers can be luminous. A unidirectional rotating bezel times elapsed time. The crystal is curved sapphire with an anti-reflective coating.
Inside is Seiko's in-house Caliber 6R55 automatic movement with approximately 72 hours of power reserve. It has 24 jewels, manual winding and a stop-seconds function for precise time setting. The bracelet closes with a three-fold clasp and includes an extender.
