The bayonet bar, at the muzzel, tends to suggest a military rifle, or militia rifle. The bayonet bar is sililiar to the one on a Baker Rifle.
CRAUSE in HERTZBURG, would HERTZBURG, be in one of the German states that was allied to Britian, because of the German George kings ?
There is no mention on the index of either Crause or Hertzburg, in De Witt Bailet's "British Military Flintlock Rifles 1740 - 1840 ", that I could find.