Seiko Prospex Black ion Baby Tuna with Seiko 4R36, 24-Jewel Automatic Movement #SRP641

Seiko Prospex Black ion Baby Tuna with Seiko 4R36, 24-Jewel Automatic Movement #SRP641

The Seiko Prospex SRP641 has been nicknamed the Baby Tuna. The protective shroud on this model is made from black ion plated stainless steel. The protective shroud increases the case diameter slightly to 46.5mm. The goldtone crown is now offset at the four o'clock position. 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 materialon the goldtone hands and markers gives the watch the same brilliant glowing properties that made the Seiko Monster such a huge phenomenon.

Lug width is 20mm. Case size is 46.5mm. Slightly domed Hardlex mineral crystal. Concave black uni-directional rotating dive bezel helps protect the crystal. Seiko black silicone-rubber dive strap. Solid screw-in case back. Water resistant to 200 meters. Day and date window.