Seiko 23 jewel automatic (4R35) movement, a date display, highly luminous hands and markers treated with Lumibrite for awesome low light visibility, a screw down offset crown, a uni-directional diving bezel with luminous PIP at 12:00, Hardlex mineral crystal and a solid etched, screw-down case back. The 4R35 Seiko movement is self-winding and it can be hand wound and hacked. The movement has a 41 hour power reserve.