Dave Person is 100% correct. There is VERY little on this gun to suggest its a "slightly cleaned" pristine example. The barrel etching, the proofs, the carving, the bayonet, it's all wrong!
I will say I bought from Paul Ambrose a gun that was a reported original1742 Brown Bess. I went through LOT of pictures and discussions before purchase at a high price. I got the gun - and luckily it was broken in shipping (not put in a wood or plastic box as I asked it be). Hairline Cracked under the lock. That gun was taken to a gun builder by me in person and repaired. It was not until I got the repaired gun home and finally got it in very good lighting and went through it with all my tools and knowledge that I realized something was very wrong. I had to remove a barrel band - then - I saw the wood underneath was brand new (as in less than 10 years old at the most). The entire gun 100% was a fake - front to back. a damn good fake - best I have ever seen. "Attic in the black" as they say - had every bell and whistle you could want on a gun of that make. Even the mortise was fake aged, slight rot, powder burn, etc. Even with a final full refund I lost a lot of my time, sleep, driving the gun 4 hours to get crack fixed, hundreds for the repair,etc. Even the gun repairer did not catch the fake - he just focused on the crack and repaired it - and it was a very, small crack - not exposing a lot of wood.
Long story short - FAKE FAKE FAKE muskets, Kentuckys, Civil War numbers marked gun, swords, etc are flooding the market and some are very good. I suspect they are coming from Eastern Europe or India/Pakistan or maybe China. These people and cultures have thousands of years of metal and wood craft and technique and in the poor areas - a man can spent 200 hours making a fake from all the details given on the internet, and to him - if he gets 2500 - 5000+ he makes a year's wage plus a lot.
Be very, very, very careful as I will tell you there are few dealers and almost no auction houses that go over their stock with a fine-toothed comb. You must do that yourself or get a buyers agent (I do now on auctions).
Last year the 2 Civil War shows in GA I attended were 50% fakes and junk. I was shocked. Covid caused the best of the best to get bought at insane prices and that brought out the fakers in droves.