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The Seiko Prospex SRP637 is nicknamed the Baby Tuna. The protective shroud on this model is made from stainless steel and it increases the case diameter slightly to 46.5mm. Inside the case is the 24-jewel Seiko caliber 4R36 automatic (self-winding) movement that hand winds and is hackable. The powerful Seiko LumiBrite luminescent material used on the hands and markers gives the watch the same brilliant glowing properties that made the Seiko Monster such a huge phenomenon.
Lug width is 22mm…
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