Hello, Omega Seamster Automatic no date the caseback states HF 168.024 166.010 SP this should not contain a cal 550 or? (serial 193...) Many thanks!
168.024 and 166.010 both can be seen inside casebacks of seamaster chronometers and non chronometers powered by 564's and 562, 565 with date. If you have a 550, you have a problem somewhere.