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Old September 30, 2012, 08:58 PM   #6
Senior Member
Join Date: October 20, 2007
Location: Richardson, TX
Posts: 7,268
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.
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.
"Smokey, this is not 'Nam. This is bowling. There are rules... MARK IT ZERO!!" - Walter Sobchak
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