Welcome to the forums from the Wiregrass! IIRC, the S stamp indicates service work during manufacturing. IOW, at some point when the gun was being made, it was rejected for an issue and sent to the service department for work. Apparently, they replaced the original cylinder, stamped the S on it but didn't stamp the serial number. Someone with more experience will need to confirm this. Also, I don't think that information would be included in an historian's letter of authenticity.
And, yes, you are correct it's a pre-Model 18.
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Guy
SWHF #474 SWCA LM#2629
Last edited by Wiregrassguy; 01-10-2021 at 08:25 PM.
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