Seiko SRPD46K1 Men’s Prospex Automatic Turtle Black Gold Series Black Silicone Strap SPECIAL EDITION Watch. Japan automatic movement with manual winding capacity. Caliber 4R36 (24 jewels). Power reserve: approx. 41 hours. Black ion-plated stainless steel case (hard coating). Unidirectional rotating bezel. Black silicone strap. Black dial with lumibrite hands and indexes. Day and date display at 3 o’clock position. Hardlex glass. Water resistant, diver’s 200-meters. Approximate case diameter: 45mm. Approximate case thickness: 13.4mm.