True, but despite this there has never been a 321 that has come into my shop that I have not successfully repaired/serviced. A lot depends on the condition of course, so if the watch has been exposed to water and is completely rusted inside, well then you are out of luck. But for routine service of a working watch, should not be a problem really.
If your 321 looks like this:
Omega or a donor movement are your only options...but hopefully no one has bought one like this or has worn it into the ocean with a pusher missing like this one was.
In the end this one ran fine after I was done:
Cheers, Al
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