I think someone probably knows a lot more about this than I do. When I got my 20 gauge damascus GH with 28 inch barrels I remember seeing 3 total GH 20ga. guns being made in the Parker Story as well.
I was very excited understandably, but after some research it appears that was a mistake. I can't remember or point to an explanation of it. I just remember reading in some older posts that those production numbers were incorrect.
I do think my damascus GH 20 is going to be my shooter at the Addieville fun shoot in a few weeks
Last year it was in the shop having a leather covered recoil pad installed on an already cut stock right after I bought it.