Steve, some early 1 frame 12's weigh more than some 2 frame 12's. By the 19teens, it seems they got the weights more stabilized, so as a general rule then , the higher the frame number , the greater the weight. There are no known 0 frame 12's, although there are 1/2 frame 12's, which do not necessarily weigh less than 1 1/2 frame guns. Although a person would have to search for a while, the lightest 12's that a person can reasonably find are the post about 1910 1 frame 12's with 26" barrels, which will be maybe 6 1/2lbs. 1 1/2 frame 12's in 28" often weigh around 7lbs, which is a nice upland game shooting weight for a 12.
I posted this on the assumption that you are serious about pursuing a light 12. Some (me) would suggest you just go find a 16 ga.
Being a Parker novice, I'm sure others can explain the frame/weight relationship better.
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