A friend of mine got a nice vintage Omega Chrono with some questions about reference and caliber. The original reference# is erased. Below the reference 101.009-66 is engraved. Serial# is 24.....of the 1277 movement, marked Omega on one bridge. The dial shows a untypical printed Omega logo instead of the golden massive Logo. The decimal skala is also uncommon for Ref 101.009. Does anybody knows something about the history of the watch? Stainless steel case has a diameter of 36 without crown. Here some pictures