I know that I do not know enough about old guitars to tell a fake from a relic'd one
The wear looks and feels different. Also, explore areas of the guitar where they'd not relic - like look inside at the bracing, check the quality of the truss rod nut, look inside the cavities (where you can) to look for wood type and condition, along with all sorts of things a relic guitar doesn't have. Things like fret wire have changed dramatically over the years - and it's easy to guess the generation based on said fret wires.
Stuff like that...
Unless it's a really good fake, there's always something that gives it away. And, if it's a really good fake, what's the difference? As far as the market is concerned, there isn't one - until someone discovers that it's a fake.
And, guitars don't have the value violins have. So, there's not a whole lot of forgery going on - but I'm sure there's some. I've had two occasions where someone tried to misrepresent the guitar they were trying to sell me. So far as I know, that is it. One put a Fender neck on a Squire and the other was a "Gibson" acoustic whose model name I've forgotten and it was really, really bad. The identifying sticker inside the guitar was on modern paper, poorly cut, had none of the right logos or fonts, and the paper hadn't aged at all - so it was bright white.
chibson is forgery isnt it?
Not really. It's a copy - and can violate some trademark regulations depending on how close it is, but it doesn't Gibson on the headstock nor does it pretend to be a Gibson - or even sell itself as a Gibson.
A forgery would need to be passed off as real, at least in my understanding of the concept.
You can copy the greatest violins on the planet and sell them - so long as you don't lie/mislead about the origin and provenance.
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