Stainless steel case. Black leather strap. Black carbon-fiber dial. Bidirectional rotating navigational bezel. Expanded date displays at 6 o'clock position. Perpetual calendar automatically adjusts for leap years. Hardlex crystal. Tang clasp. Case diameter 40mm. Case thickness 13mm. Quartz movement. Water resistant at 100 meters (330 feet). Alternate Model Numbers: SNQ043, SNQ043P1, SNQ043P-1. Seiko Perpetual Calendar Steel Black Mens Watch SNQ043 