while looking for parts for my Potsdam musket I came across your web site and the question about the markings of the musket. Mine has the FW over the crown with the numbers stamped on the barrell. Mine was not in a Landwehr reg., but a reserve unit, Nu 11, 3rd. batallion of the second schlesisches inf. reg. belonged to the 1st. army-corps under GeneralZieten Army of the Niederrhein which fought at Ligny and Waterloo.
I am also having trouble finding some parts for it.