| Signature mark | NL 174/0625 |
|---|---|
| Subject | Brief |
| Author |
Alvan Clark & Sons <Cambridge> |
| Recipient |
Mach, Ernst
|
| Title | Alvan Clark & Sons |
| Places | Cambridge |
| Duration | 19.06.1891 |
| Scope | 2 S. hs. |
| Formal information | Languages: Englisch |
| Rights notice | CC BY-SA 4.0 |