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Checking out my mod. 66 that I recently inherited. Ser. # is 2K82XXX. This belonged to my grandfather and then my father.
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....It is from 1982 and 2X713 is the assembly number which should also be on the left side of the grip frame.
S&W moved the trademark from the sideplate to the left side in 1981 on K-frames.
For a little while it was the small, 'j-frame' trademark but then they went to a larger one seen from then on.