Does the seller have proof of a service (not just their word) from a known good service provider? For example paperwork from the service provider?
If this was serviced 1.5 years ago, in my view the job was not done well. The case back gasket is decades old, so that was not replaced during the service - this is a pretty standard thing to do during a service. Clearly the rotor is/was rubbing on the inside of the case back. I find it improbable that a watchmaker would replace the worn rotor pinion, yet leave an old case back gasket in place.
If you buy this, plan on doing a service in the very near future IMO.
Cheers, Al
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