I've seen the rifle. It's way too young to have been at the Battle of Kings Mt in 1780.
It's been "reconverted" to flint, but I don't believe it was flint originally.
The barrel is marked "J. Dickert 1776". The "J. Dickert" and the "1776" were engraved by two different guys. The "J. Dickert" by someone (perhaps THE J. Dickert) who knew what he was doing. The "1776" was worse than my engraving. When I saw the rifle several years ago, I suggested that perhaps an old barrel had been restocked at a much later period. Someone used to looking at J. Dickert rifles needs to look at the barrel, though.
Andy