Agree with
@Noddyman - the back wear is perlon or nylon of some kind which was popular through the late 60’s-80’s for sport watches. People don’t realize what they can do after years of wear. Rotor wear is pretty common and may have been addressed in a prior service, maybe not. It’s a standard wear issue and any competent watchmaker can replace the bearing. If the seller doesn’t say serviced nor had documentation- assume it needs it.
The dial is great- we usually don’t see them that clean nor in white. Case is a little dinged up but it’s honest and not polished to a nub and nobody will ever see the back except you.
These do fetch more than their sunburst dialed siblings so that needs to be factored, but perhaps the case condition and rotor wear/ need for a service to address it can be used to your favor in negotiations
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