No problem that Beretta likely did the serial number. Restamped serials are seen from every gun maker at least sometimes. It is a leap of speculation to then say that it is related to the UA47 marking.
That is more proof that it was renumbered at Beretta. They probably had a frame with a number already on it and reused it. Colt did the same in WWII with 5000 guns.
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