Parker 12's were patterned with either 1 1/8 or sometimes 1 1/4, but most tags I have seen say 1 1/8, so lets assume yours was also 1 1/8oz. I don't have tables for #7 shot but I do for 7 1/2 and 8 and it comes out to 350/oz in 7 1/2. So 350 + 44= 394, round to 400.
RH 125/ 400 = 31% pattern. LH 225/ 400= 56%. Looks about IC and Mod by today's standards, very much of an upland game gun. Maybe the good doctor went out to Beeville and Kingsville to shoot quail on the King and Kenedy ranches or ducks around the Houston marshes. Maybe you have a piece of Texas history in hand.
Some folks like to proclaim that all old Parkers were choked tight, but I've found that some are and some aren't.
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