I have a German musket, from Prussia, originally manufactured as a percussion gun (the 1809 would have been a flint lock converted to percussion) in Suhl. It was originally made for and issued to the German Federal Navy (naval anchor and cartouches) created in 1849 but disbanded just a few years later. In 1861 several hundred of these muskets were purchased by the City of Philadelphia and issued to the Phila. City Guard. Before they received them they were sent to the Wurflein Brothers, noted Philly gunsmiths, for inspection. If they passed the tests (almost all did as they were originally well made and little used) the Wurflein Brothers stamped them with their name and City of Philadelphia. They are the only additional markings added to the imported firearms. That City Guard was only once activated for combat, late summer of 1862 so the guns again saw little use. After the war most were nickel plated and given to the local GAR who used them for decades in their parades. Some of these Suhl muskets, not the ones issued to the German Navy (no anchor and cartouches), also wound up in the States where some of them saw some hard usage. They are not marked with the Wurflein brothers name nor the City of Phila. I have never noticed if any of them had some other American markings added.