joshuadan: Your 15-4 dates from 1980. As you noted, 86K2307 is the serial number - the C10 and 94042, which I assume are stamped in the frame cutout when you swing the cylinder out, are known as "assembly numbers" that are used during manufacture and have no particular significance. The .38 S&W Special CTG marking on the barrel is the caliber - .38 Smith and Wesson Special, more commonly known as just .38 Special. "CTG" is the abbreviation for "cartridge."
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