Agreed on it likely being Austrian. That kinda' sorta' looks like a classic Austrian double-headed eagle (maybe) and the buttplate marks have a distinct "Germanic" appearance. As for a potential reconversion, I can't really say but yeah, it does look rather awkward. I would pass on this one and look for something a little nicer for your historian's graduation present (I presume that's your intention?) I'd suggest one of the U.S. Model 1816/22-type muskets. The vast majority out there on the market were converted to percussion just before the Civil War. Something halfway decent would be a bit more than $900 but not too much more. Original flint, much more expensive. Check out Gunbroker.com for starters. Regardless, if you're looking to shoot anything old, be careful on your loads - don't get too enthusiastic with the powder. Just my two bits.