He might be able to hear a large beat error (sort of the difference between tick and tock). If you have a mantle clock that's out of beat, it will drive you mad listening to it as it is very noticeable and sounds like someone with a limp.
On the other hand, this tells you nothing particularly about the state of the movement service requirements really. Couple of pointers:
If your watchmaker allows you to be at his bench then he has no real concerns about cleanliness. I don't allow anyone else into my clean room. If you'd asked to be present at my bench, I'd have turned you away.
If your watchmaker is desperate for work and making it obvious, then he's probably no good. There is sufficient work out there for any watchmaker who knows what he's doing.
Regards, Chris
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