The Seiko Presage Cocktail Time “Blue Moon” Open Heart (SSA405J1) is an automatic mechanical watch featuring a 40.5mm stainless steel case, a rich blue gradient dial inspired by the Blue Moon cocktail, and an open-heart aperture at the 9 o’clock position.Specifications & FeaturesMovement: Calibre 4R38 automatic with manual winding capacity and a ~41-hour power reserve.Crystal: Box-shaped Hardlex crystal.Strap: Blue calfskin leather strap with a three-fold push-button clasp.Water Resistance: 50 meters (5 bar).