Chip, too bad the barrels weren't the other way around - 12 ga. 28" and 16 ga. 30"
I have a couple of Parkers with two barrel - two gauge sets that didn't start out as two barrel sets but they are pretty versatile the way they are.
Your Parker should be on a 1-frame, is it? It should be stamped on the bottom of the rear section of the barrel lug of the original 16 ga. set. There should be a 16 stamped along with the stamp of the frame size - probably a 1
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