Dave,
Serial number 1213XX would make this a 1903 Parker. I checked the "Book" and only four Parkers were listed and they were all 12138X and none were 10 gauge or "P" grade. Parker was still making hammer guns in 1903. My guess is that it was left in the shed after the barrel burst. A lot of shotguns were kept loaded in out building (I found a VHE 20 gauge in a corn crib). My guess is that something "nested" in the barrel and caused the burst.
Harry
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