I kinda lost track of this thread. Matt, that is a fantastic find, plain and simple. Did your gunsmith have a date for that rifle? I'm assuming it is rifled, and is it a flintlock? I hope you can get a history of that colonial gunsmith. Amazing that it survived at all, phargin phenomenal that it is in such great shape. Was the bottom peat like, where he found it?
The rifle is dated to 1850 and is a cap and ball percussion, it was recovered from a peat like bottom with a high tannic acid level and very low oxygen content thus preserving it.