Parts availability has always been a problem for collectors of any old machinery. Be it one of my hundred year old pocket watches or my 1963 Gilera 125SS, it can be difficult keeping this stuff running, but parts are out there.
As for independent watchmakers, one of the two I use has been bitching about the availability of Omega parts and the impending doom of us all for about 5 years now, yet he still puts parts into my "too old to be supported by the factory" Omegas without much difficulties. (the last time it was an early 20s piece, the time before a railroad piece from 1905)
The other guy I use simply goes in the back, disappears into a cloud of boxes, dust & cussing for about 25 minutes, and then reappears with the required part.
If he says he doesn't have it then I email Dave.
He usually mails it out within two days.
If you're too afraid of damaging it for lack of parts, quick! sell it now while its running.... but the stuff is out there and will likely continue to be out there for those with the patience to look for it.
The watch I'm wearing now is from a company that went under about 85 years ago and I recently had a new mainspring installed after a wait of 1 week for the part. No worries.
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