Interesting gun, and good buy Eric, although this one doesn’t lend itself to an easy regional attribution. At least not for me.
With the side plate and butt stock shape you could say Lancaster, except for the long wrist running down into the stock. The shape of the forearm, at least in the pics also looks a little Lancaster-ish. The lock and side plate moldings, and the small swelling at the rear RR pipe are pretty distinctive, as is the carving around the tang, although they’re not ringing a bell with me, although somehow I feel they should!
I’ll agree with Mike that the butt plate and trigger guard are imports, and I’ll include the ram rod thimbles as well.
I googled the name D. Gafvert and didn’t find one, but did find several Gafvert, even some in Bucks County. A genealogy search with a lot of luck might find your guy, and maybe where he came from before Bucks Co?
For an obscure clue, find a signed rifle with the same engraving details on the rear sight, and you’ll have your maker!
Luckily, it looks like no one has previously tried to re-glue the broken parts, and that will make the fix-up a lot easier. A little bit of glue and a lot of work on your part, and you’ll be able to put her back in presentable condition.
John