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The Seiko Prospex SPB383 is an automatic diver's watch with a GMT complication, styled after Seiko's 1968 professional diver. It pairs a 42mm stainless steel case and bracelet with a black dial, LumiBrite-coated markers and hands, a ceramic bezel insert, and a sapphire crystal. The 24-hour hand tracks a second time zone, so it works as a travel watch as well as a dive watch. Against the standard Prospex divers it adds GMT function and a ceramic bezel; against Swiss GMT divers it offers comparable specs in an automatic mechanical package.
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Owners of the SPB383 praise its build, legibility, and the value of a mechanical GMT diver with a ceramic bezel and sapphire crystal. Common criticisms center on the 42mm case size and the thickness that comes with the automatic GMT movement.
The Seiko Prospex SPB383 is an automatic GMT diver's watch. It reinterprets the case design of Seiko's 1968 professional diver's watch and adds a second time zone function. It was introduced in 2023.
The 42mm stainless steel case has a super-hard coating for scratch resistance. The black dial has hour markers and hands coated with LumiBrite for low-light visibility. The unidirectional rotating bezel has a scratch-resistant ceramic insert for timing elapsed time. A sapphire crystal with an anti-reflective coating covers the dial.
Inside is Seiko's in-house Caliber 6R54 automatic movement. It can also be wound by hand. A dedicated 24-hour GMT hand tracks a second time zone and can be set on its own in one-hour increments.
