There are no records denominating guns made with the various frame sizes.
TPS lists the frame sizes available for each gauge. Yes, there are 12ga's in 1, 1 1/2, 2 and some in 3 frame size.
The weight variance between frame sizes is slight, a matter of a few ounces. What makes a big difference is the barrels to fit them. And then the barrels can be contoured so that it is again only a matter of a few ounces. For example, there are 1 frame 30" guns that weight 8lbs, others at 7. There are 2 frame 12 30's at 7 1/2, others at over 8.
If you are looking for a Parker, my recommendation is to look at each gun individually. As a general rule, the smaller the frame size, the lighter the gun, but at the result of having lighter/thinner barrels. There are some very nice 2 frame guns that weigh more or less 7 1/2 lbs, which makes them ideal for target shooting and shooting heavier hunting loads. If you are interested in guns of a certain weight, then look for the weight rather than frame size. When these guns were being made, buyers ordered by total gun weight and Parker selected frame size accordingly. I am not aware of any Parker order in which the buyer specified a frame size, but my knowledge of those records is limited by what I have seen or been told.
I see Dave Noreen responded at the same time as I did. I think we are in agreement. To me, the more important question is "what do you want to do with the gun, what shooting activities do you want it for?".
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