Nice 38 Safety. The 5th Model production ran from 1907 to 1940, but by 1920, demand dropped off and there is no way to come up with an accurate estimate for ship dates. Ending serial number for the 5th Model was 261,493. It could have been late 1920s to the late 1930s. Only a factory letter would give you the answer to your question.

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Gary
SWCA 2515