The rifle appears to be early 19th century Berks County school having components that resemble other rifles from Berks County such as similar patch box finials and trigger guards and the Roman nose stock profile.
Everything about this rifle, the patch box, trigger guard, inlays and the nicely engraved side plate would make one to speculate that it may have been built by an apprentice of the Kutztown Angstadt gunsmiths. The simple floral motif at the tail, it appears to be original, is another indication of apprentice work.
There are remnants of a signature on the barrel but are worn to the point where they are impossible to read. The flintlock is marked “Ketland & Company” and the rifle has been converted back to flintlock configuration using this period lock.
The 4-pc brass patchbox is, as you can see, not engraved. The brass trigger guard is of the Reading style.
All these features are typical of Berks/Kutztown rifles. Sure wish these things could talk.