Stellar purchase. Mount serial might be questionable to some, but if you refer to some of Weaver's examples or any other examples I think every number appears legitimate and I see no reason to question the numbers on the mount.
There's nothing fresh about the engraving either and only a slight lack of the typical neatness in the straight-line alignment can be observed.
Everyone has their own opinion here but to me there is nothing that suggests those numbers are neither legitimate nor period original and I'd be elated with such a purchase!
Congratulations to the buyer!
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Everyone can form their own opinion but