Hard to tell ones are those in great metal shape, but regionally "enhanced". For example, the M1930 that I shoot has a polished grip strap. I guess there was some light rust dots there in the past, previous owner aggressively clean it using steel wool. If this grip strap is regionally reblued, it will be hard to tell due to other area is all original. Of course, I won't do that. But who can guarantee its future owner won't do that....
Checked a Schnellfeuer a few weeks ago. Its grip frame (registered) is all original, but its barrel has a digit professionally erased. Barrel and frame matches Form 4 s/n. If that digit was erased to "force matching", that's purely based on wrong knowledge -- the frame number (i.e. registered number) is only partial s/n in Mauser. The work was done very professionally though.
Regarding FN 1900, there were viewers asking "is this professionally restored".. being cautious is good, but that caution was applied on wrong object. I have never seen a single regular FN 1900 being professional refurbished. Its current market price does not support that yet.
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