It was made anywhere from 1920, when Stevens switched from the double-hump to the single-hump in the Model 520, to the 1932 discontinuance.
Savage/Stevens didn't keep SN records - but you "might" be able to obtain ($$) a more definitive DOM by contacting a fella named Callahan in Mass (google), who has some sort of factory ledgers, IIRC.
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