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This pad was recently discussed on the NCRS TDB and the consensus was that it is most likely original. Many upside down stamps have been documented as original.
Jim
From what I have read and heard in my very limited experience, I don't think there is any way to assess validity at all when the pad has a heavy coat of chevy orange paint on it. Certainly without any question though, we can see the vin derivative is upside down.
July 2, 1963 Milwaukee Braves at San Francisco Giants Box Score ...Tuesday, July 2, 1963. , Candlestick Park. Attendance: 15921, Time of Game: 4:10 . Braves ... TB: D Crandall 2; D Menke 2; F Bolling 2; W Spahn 2; M Jones. ...
Maybe the guys that were actually there can chip in, but with the VIN stamp upside down, wouldn't that mean the whole car was going backwards down the assembly line?