Member JP@AK is the local expert on these, but it is a .38 Military & Police revolver from early 1947 or so, with the S prefix. In 1948 until the late '60s it would have had a C prefix. The four digits near the letter S are an inventory or rack number that was added after it left the factory.
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Alan
SWCA LM 2023, SWHF 220
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