Gervinus (Herr aus Frankfurt)
| Louis Spohr an Wilhelm Speyer in Offenbach | Kassel, Sonntag 1. August 1824 | 1824080102 |
| Wilhelm Speyer an Louis Spohr in Kassel | Offenbach, Montag 22. August 1825 | 1825082232 |
| Louis Spohr an Wilhelm Speyer in Offenbach | Kassel, Sonntag 1. August 1824 | 1824080102 |
| Wilhelm Speyer an Louis Spohr in Kassel | Offenbach, Montag 22. August 1825 | 1825082232 |