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The SPB317 is Seiko's modern reinterpretation of the 6105-8000 diver, nicknamed the Slim Willard. It has the thinnest case of any Seiko automatic diver, a cushion-shaped stainless steel case with super-hard coating, and a five-row bracelet. Inside is the 6R35 automatic with 70 hours of power reserve, sapphire crystal, and ISO-rated 200 m diving capability. It suits divers and desk divers who want vintage looks in a slimmer, more wearable package than the chunky Willard reissues, though it costs more than Seiko's entry divers and its movement is not as accurate as Swiss rivals at the same level.
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Owners praise the slim case and vintage-correct looks, calling it one of the most comfortable Seiko divers to wear daily. The 6R35 movement draws mixed comments on accuracy and winding feel, and some find the bracelet and clasp below the standard of the case.
The Seiko Prospex SPB317 is an automatic diver's watch that reinterprets one of Seiko's most iconic designs. It has the cushion-shaped case and recessed crown of the original. The case is the thinnest of any Seiko automatic diver's watch to date.
The case is stainless steel with a super hard coating. The curved sapphire crystal has an anti-reflective coating on the inner surface. The watch has a black uni-directional rotating elapsed timing bezel, a screwdown crown and a screwdown caseback. The five-row bracelet closes with a newly developed compact tri-fold clasp with a secure lock and an extender.
The clean white dial has a date calendar. The hands and markers use LumiBrite. The watch follows ISO standards for scuba diving and is water resistant to 200 meters. The 24-jewel automatic movement can also be wound by hand.
