The Seiko SARB017 field watch is powered by the premium Seiko 6R15 caliber self-winding movement that can also be hand wound and hacked. It is the same caliber that powers many of the Seiko Prospex line of watches. The movement has a generous 50 hour power reserve. The case has a fine brushed finish and the green dial sports highly luminous goldtone hands and hour markers. A date display is shown at the 3 o'clock position. A scratch resistant sapphire crystal is used to protect the dial. The watch is water resistant to 200 meters. Note: The crown at 4:00 turns the inner (compass marked) bezel. Case is a mix of brushed and polished stainless steel. Features Movement: Seiko 23-Jewel 6R15 Caliber Automatic (self-winding, hand winding, hacks) Case: Polished .