Mine is #41,238. It is a #1 frame 28" lightweight with .015 choke in both barrels. A real bird gun. D1 top action guns are fairly scarce, but I did almost buy one on one of the gun sites. It had a few issues but was probably a solid gun.
Bill, this one is not a lightweight. It has 30" barrels on a 2 frame weighing in at 9lb-2oz. I think I remember it measuring improved modified and light full. I got this one on Gunbroker a couple years ago. It could be the one you were looking at. I agree, you don't see them very often.