The Seiko Prospex Land Tortoise SRPH17J-8 is a mechanical automatic timepiece. Equipped with the Seiko calibre 4R35, the SRPH17J offers both manual and self-winding automatic movement capabilities, boasting an approximate operating accuracy tolerance of 45 / -35 seconds per day and a power reserve lasting up to 41 hours. Encased in a 42.4mm stainless steel case with a thickness of 11.7mm, it is meticulously finished in full stainless steel, featuring luminescent hands and indexes and a scratch-resistant sapphire crystal. With a water resistance rating of 200m, this watch also includes a rotating bezel, screw lock crown, screw case back, and a date display. The new series of the Seiko Tortoise SRPH17J is sure to become another cult classic, distinguished by its timeless black dial and matching rotating bezel. - Caliber No. 4R36 - Automatic Movement – Powered by the movement of the wearer - 41 Hours Reserve - 23 Jewels - 42.4mm Case Size - 11.7mm Case Thickness - 20mm Lug Width - 150g Weight - Stainless Steel Case and Bracelet - Sapphire Crystal - Three-fold claps with push button release - 200 Meters Water Resistant