Scott,
I thought the round or ball grip were pretty much the same thing. The book says yours is a pistol grip, but it appears to be ball/round.
DHBP refers to a dogs head butt plate, a hard rubber butt plate used on many lower grade guns. Cant tell from your pic, but I would expect yours to have a plain steel butt plate.
The serialization book says yours is a grade 0 plain twist with 30" barrels, although it is not always accurate. They are sometimes a bit over, but 30.5 is way over.
The gun looks like a nice one. If the barrels are in good shape and still have their wall thickness it could be a good shooter. I have a couple I shoot close in # to yours.
The 1 on the barrel lug is the frame size. That 12 probably swings real nice. I like the lighter 1 frame 12s, especially lifters. Congratulations.
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