If it's a W+F Bern refinish using the original technique, it can sometimes be very difficult to tell (unless there is a visible surface alteration underneath) and should not significantly affect the value... if at all detected.
The one I was offered for 1800.- CHF was clearly not a W+F refinish (not exactly the same colour) even though it wasn't a bad job, but not the W+F standard. Then again, prices in CH generally tend to be a lot lower than in the US for this kind of item.
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