Hi Steve,
I agree with Ron. I'd bet it's a 30 cal. Looks like a very nice typical Alphabet commercial/1920 commercial, made in 1924. S#1238n, The lower case 'n' is part of the serial #. The 38 stamed on various parts are the last two digits of the S# showing it has matching parts. You would have to do a partial takedown to see if the trigger, breechblock and center toggle match, which it probably does, making it fully matched. The crown/n stamps are commercial firing proofs applied after it passed a test with over powered rounds.
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Mike C.
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