OMEGA POCKET WATCH Reference: 121.1740. Chrome case. Inner case back engraved with ‘ADB’. White dial with Arabic numerals. Manual-winding mechanical movement (Unitas calibre 6497). Plexiglas crystal. Circa 1970. Diameter: 48 mm. A chrome pocket watch with a mechanical movement, by Omega. Circa 1970. Condition: Sold as is, with signs of wear and use. The chain link is missing. The movement was in working order at the time of writing this description; a routine service is recommended; no warranty provided.