My surmising would be as follows, for what it's worth ...
"Old Musket" could be any of the earlier flinters that were converted (and some not converted) to percussion. These would include (if limited to 19th century) M 1808, M 1812,
M 1816 and M 1835 musket.
German rifles were likely Dresden or Suhl as you said.
Austrian rifled muskets were probably of the Lorenz pattern. U.S. also imported some Jaegar rifles, Garibaldi rifles and Consul locks from Austria, but not in as great numbers, and these were of differing calibers.