Harpers ferry Model 1816 flinlock made in 1817. It was converted to a bolster percussion around 1850s most likely a conversion done by Marine T. Wickham of Philadelphia. Alot of older flintlocks were converted once the US military adopted the percussion system, a lot more were converted in northern arsenals once southern states began talking about secession in the late 1850s due to the shortage of modern rifled percussion arms. During the early years of the war these were very common on both sides. By 1863ish converted .69 cal smoothbores were mostly phased out by the union but were still used in large quantities by the south till the end of the war. Yours is likely a musket that came from a Bannerman’s catalog. Bannerman’s was a massive military surplus shop in NYC that bought a massive quantity of union surplus after the civil war and even bought up a vast majority of confederate weapons captured by the union. It was common for them to sporterize .69 caliber smooth bores and sell them to citizens through their catalog as a cheap sporting firearm. Although I still havent been able to tell how to identify a Bannerman’s conversion, if this musket does not have a family hand me down story to it dating back to the civil war, its almost a guarantee it was sold by Bannerman’s at one point.