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The S serial number prefix was actually first used on K frame revolvers around the end of World War II. I can't remember if before or after.
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It was afterwards. The S prefix indicates the presence of the sliding hammer block that is still used today.
FWIW S-prefix K frames and N frames can be distinguished by numerical range; K's are 811,xxx thru 999,999 while N's are 62,xxx-333,xxx.