Interesting
It means the movement originally came in a seamaster
like this: (borrowed photo)
I expect this sort of thing to be common as swapping a movement is so easy i can do it.
I also hear stories from "old men" who used to work on Omegas, for Omega, in the UK many years ago, who said they didnt really care which movement went back in, as long as it was the same calibre. (they also said that case backs were swapped too.)
There is also evidence to suggest Omega themselves swapped entire movements on service, but I am talking over 30 years ago.
Still, it isnt nice news to get, just no surprise.
I dare not certify mine....!
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