I have one like yours (in nickel as well) with a serial number in the 623,xxx range. If you assume that the production was relatively steady from 1915 to 1942, (which is a big assumption), then that would put our pistols in the 1929-ish range.
I'm going to send off to S&W for a certificate of authenticity that should tell me exactly when mine was made and first shipped. When it arrives, I'll post the information here, since yours should have been made only a month or so after mine.
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