Seiko Prospex Tortuga 42.4mm automatic stainless steel watch SRPH17K1 at the best price. Official Distributor. Seiko Prospex Turtle Watch 42.4mm SRPH17K1 This Seiko Prospex Tortoise model is known by this name because of its inspiration from the popular diver's watch shape nicknamed by Seiko fans as "The Tortoise" due to its shell shape. Powered by 4R35 automatic movement, with 200m water resistance, highly visible indices and screw down crown at 4 o'clock. A rugged watch designed for elegant functionality. The glass is sapphire. The bracelet is stainless steel. With screw-down crown to guarantee its tightness. Automatic with manual charging capacity of approximately 41 hours. Green dial with luminescent indexes and hands prepared for the perfect vision of the deep sea. Designed for sports lovers and adventure seekers on the water.