$300 is a steal. The 3rd edition of the SCS&W talks about the approx 40,000 revolvers sent back to S&W for the new design hammer block. "Revolvers returned and modified are found with a small "s" near the rear sideplate screw, as well as a "S" found on the butt along side the serial number."

in parans is from the SCS&W

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Mike
S&WCA #3065