There are instances where replacing parts inside a watch would make the watch less desirable, even if the parts used are contemporary to the watch, and not modern replacements. The example that comes to mind are American made pocket watches. Many of these watches have the last 3 digits of the serial number scribed on parts all through the watch - barrel, underside of bridges, underside of balance wheel, etc.
Those who collect these value the serial numbers matching - not everyone does of course, but if you are really into the US made stuff this is important. In those cases I try my best to use the parts again by repairing them if needed - of course there is usually a limit to how far I'll go, and that is what the client is willing to pay.
If I need to send a barrel out to have a sheared off tooth replaced, it's going to cost more than the watch is worth likely, and every collector has their limit...
I've not seen an Omega, or any Swiss watch for that matter, that has similar matching serial numbers on it.
Cheers, Al
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