Can anyone here tell me what this number on this Omega Seamaster ref. 145.029 case-back means? Is it a personal engraving or more likely something military? Never seen this but I am not an Omega expert. Thanks. Bernard De Vos
Not this time. The cal. 1011 is a chronometer grade automatic, time-only movement. The OP's watch has a cal. 861 manual wind chronograph, like a Moonwatch. That looks to be an internal organizational serial number. . You are correct that some later Omegas have the caliber number engraved on the back in a similar manner. gatorcpa