Hello Robert: You have a very early underlifter Parker which is most likely a 12 bore chambered for brass shell. I have SN 1248 in it's original oak case with a number of Remington brass cases. Your's could be a eleven bore, but that would. Yours just missed the SNs in "THE BOOK". Order a letter from PGCA and if the information is available it will tell a lot more.
Best Regards, George
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