Could have come from Scotland, Wales, England, Germany, Netherlands, Belgium, Ireland or even France. It would be interesting to find out what other coins he had? What size was the musket ball, British or French?
Only analysis of the teeth can provide detailed information on where someone lived prior to death.
But whatever, I hope the remains are reburied and a suitable memorial produced. There are too many of all the above nations soldiers buried in unmarked graves.
Perhaps us socalled 'europeans' need to start looking after our battlefields a bit more like the US, where they show a lot more respect for there nations war dead!
Final resting place disturbed and remains damaged to make a carpark and all on probably the most famous battlefield ever!