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Jerry, I'd say it is a 20 bore poacher's gun. May have to take the tube off to find the mark of the Zella-Mehlis mechanic that made it. Proofed at the Zella-Mehlis facility in October 1921, which you probably already have discerned. There may be a maker's mark over the 2nd Eagle Crown over S effort/stamp. Wonder why it experienced the preliminary proof twice unless it was to meet the 1911 proof rules.

Nice condition.

Kind Regards,

Raimey
rse