Hi! That watch, to me, appears to be assembled with a custom gold case (not a single reference number, hallmarks all over the case, no Omega stamps, seller that claims 2 different type of gold used in it) and an Omega 268 movement. With that being said, it is possible that was assembled back then. Some Countries had local customs and luxury taxes on luxury goods so the importers used to acquire movements, dials and hands and put them in cases that were made in their own Country. It's not a very common practice and I'm not sure if in circa 1964 (s/n on the movement) they still had to do it. I personally wouldn'y pay a single penny for it. Keep looking for a 100% genuine vintage Omega and remember to look for stamps on the inside of the caseback
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