Friedrich I. Baden, Großherzog
| Franz Joseph Keppner an Louis Spohr in Kassel | München, Montag 1. August 1853 | 1853080146 |
| Adolph Hesse an Louis Spohr in Kassel | Breslau, Donnerstag 25. September 1856 | 1856092531 |
| Franz Joseph Keppner an Louis Spohr in Kassel | München, Montag 1. August 1853 | 1853080146 |
| Adolph Hesse an Louis Spohr in Kassel | Breslau, Donnerstag 25. September 1856 | 1856092531 |