The answers, of course, all reside inside that watch.
A local vintage watchmaker ought to be able to disassemble the watch and take photographs relatively easily on behalf of the seller. It's quite possible the movement was swapped during a service, but I would expect documentation of that swap somewhere in those service receipts, as well as a larger than expected service cost for those new parts. More likely those receipts belong to another watch.
If an unknown watch history bothers you, a lady's steel Geneve should be fairly common and another nice example will eventually come along.
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