Congrats on this very exceptional find.
Most likely a 2915-2.
I'd recommend to have the watch opened by a qualified watchmaker and see if the movement is matching the reference, because OMEGA sometimes swapped the movements instead of servicing the original ones in the early 60s. You should expect to find a 15.996.xxx, 15.997.xxx or maybe 16.648.xxx movement serial inside.
I have a question concerning hour and minute hand. Are they cambered or flat? The hour hand looks flat in the picture.
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