It seems too heavily embellished to be a private's musket. Way too much engraving, which leans toward an officer's piece or a nobleman's hunting piece. Note the engraving around the butt plate screws. A bayonet in case one runs into boar while on foot looking for the downed boar or a downed deer..., or for the officer if he runs into hostiles up-close-and-personal on the battlefield. The nose cap is not solid, but is a brass wrap with the butt of the bayonet resting on stock wood, which to me says 2nd quarter of the 18th century. That an officer of any of the major armies would have a custom piece with parts from many locations in Europe would not be an oddity.Looks like a British fusil probably a personalized fusil. I’d say french and Indian war era. A couple of things tell me it’s British. 1. The frizzen spring final and 2. The thimble styles.
LD