I know this rifle well ... it came into an antiques mall in Adamstown, Pennsylvania, some 9-10 years ago. Ray Nordberg and I shared a booth in the mall selling Pa. Rifles and associated antiques. We knew about the rifle for years as it was owned by a nearby furniture restorer of national repute. He admitted to doing some restoration to the surface and, as I recall, some work on the lock. He said he bought it in Lancaster County. It is a wonderful rifle in the Angstadt style with a unique lion under the stock. It shows Peter's shallow but competent engraving on the patchbox and other typical Angstadt features. I included the rifle in my book, BERKS COUNTY LONGRIFLES AND GUNMAKERS, 1750-1900, published in 2009, page 57.
My partner Ray bought it and it was on desplay at the Mall. Some years later, Ray sold the rifle at the old Pottstown, Pa show to Mike D'Ambra, a very active dealer. It was also shown at a Kentucky Rifle Association Annual Show around that time - 2010-15. Ray died about 3 years ago.
You are fortunate to have such a nice rifle.. leave it the way it is...
Patrick Hornberger