(tested for+p+)
For informational purposes only when S&W introduced the M640 38Spl serial numbers with the prefix of (CEN) were marked per the following: (TESTED FOR+P+). Later production the (Tested FOR+P+) was deleted. The marking appears in the frame cylinder window. I have one so marked. The rational for subsequent models with the marking deleted was there was no industry standard for (+P+) at that time.
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