Yeah, in the early days, whatever came out of the USSR usually had the serial numbers scratched out, sometimes pretty deeply gouged out. I recall, at the first OMSA I attended in 1976, that there were some shifty looking types making the rounds of tables in the bourse, jotting down the serial numbers of the few Soviet awards that were for sale that still had legible numbers. Surprisingly, they weren't buying them up or demanding their return (as Putin's mob does these days), just recording the numbers. I always wonder what happened to the recipients and/or their families. The other possibility, of course, is the one you raise that it is a less-than-kosher museum "escapee". In essence, that it is stolen goods . . . . The added serial number would seem to just be a fraudulent addition, an effort to restore some value to the piece.