Thanks for the reply, Dick. I have poured through H. Kauffman, C. Kaufman, Kindig, Dillin and Sawyer. The closest similarities of engraving style, that I could find, are the works of both M. & F. Fordney. I have spent hours searching the ALR virtual museum. Can you suggest any other sources?
I think that the reason for the long comb is really a short wrist. It is a very small gun. Only 56" long. LOP is 12". Weight is 6.5 lbs. The triggerguard is 7.25" from the tip of the front tang to the tip of the rear tang. The guard opening measures 1.720" front to rear on the inside of the bow. The swamped barrel measures .835" at the breach, .750" at the waist and .820" at the muzzle. The lock (J. Cooper) is 4.70" long and .900" high. Patchbox is 6.560" long and is 2.450" wide where it meets the buttplate. Wrist is 1.070" wide and is 1.250" high. The bore measures .440". I guess that this is a long winded way of saying this is a very petite rifle. It was first acquired by a family that settled in the Easton, PA area in 1738. It has been passed down through the original owners family til this year when I acquired through a dealer. I have the provenance and would share it privatel,y if the family allows me to.