Omega, Speedmaster, Classic, "Triple Date Moonphase", chronograph, ca 1991. Case size: 39 mm Material: steel/gold Movement: automatic, caliber 1150 (Valjoux 7751) Year: circa 1991 Crystal: plastic crystal Bracelet: leather strap Reference number: DA 175.0034 Serial number: 53'799'879 Case number: 175.0034 Minor wear. Minor scratches.