I understand the meaning of the C.O.S.C. certification, the five position adjustment and the +6/-4 secs/day accuracy. My question is that for a non-certified watch with say an ETA 7750 movement, is it reasonable to expect that it can be regulated to within C.O.S.C. specs (even though it might not have been at the factory) or are the movements modified further by the manufacturers if they are destined for certification? I guess more simply put, can a good quality non-C.O.S.C. movement be regulated to within C.O.S.C. specifications?