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Originally Posted by BLUEDOT37
I don't when it started, or when it stopped, but S&W used to change the first digit of the SKU# to a "6" when it was returned & resold.
I found that out when I bought my 4013 (SKU# 608524, below). This procedure is mentioned in the SCSW also.
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Standard new production SKU# is 108524.
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And some had a "U" stamped on the trigger guard
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Have similar mark "U" on more than one gun - none of which were returned to SW and resold "Used" as far as I know. I think that is unrelated but would be curious if anyone else has same or knows what it means