I tell my clients almost all serviced vintage watches are polished. If its not the case then they come out of a safe. You can only tell when its from first owners who can prove that with receipts etc. otherwise most of the time/quite often it are fairytales and made up BS stories by fellow dealers.
I respectfully disagree. This sounds like lazyness 😉 (but agreed re the ‘fellow dealers BS stories’ bit...one should let ones own eyes and knowledge cut through the crap)
If one does ones homework and looks at enough untouched specimens (for watches in question that are well documented in pictures, or/and that one passes a lot through their hands), it is fairly easy to be able to tell with certainty the untouched cases from the touched cases. That includes surface finish (brushed/polished, transitions, sharpness of edges, brush grain size and direction etc etc etc). Manufacturers repeated the same process on thousands and thousands of cases thousands of times...repeating the same pattern.
Even with perfectly refinished/relazered vintage Rolex, there must be tells of tampering (ie too perfect, like the case spent its whole life in a safe, not often honest dings etc etc etc, but here I have not done my homework nor do I intend to). You most likely have to be a Rolex case refinisher to have this kind of knowledge.
Its not lazy. I just want to educate my clients that before they start asking these questions they really have to know where they are talking about.
There are a lot of people that dont know how to use a loupe let alone that they can tell what chamfers or bevels are and what are the different techniques of polishing.
My polisher does APRO refinishing and 99.999% cant spot the difference when they come out of the factory after he has refinished the case.
For the rest when people ask I say most of the time that a case is polished. It makes No sense to me to put a €3000 watch under the microscope.
Its not lazy.
He doesnt care if a case is vintage or pre-owned. He just wants it to look again like factory standard.