Hammer (Bz. Posen) was formerly part of the German Empire. In the German Empire, the place was called Waldhammer.
The place is now called Kuźnica Zbąska and belongs to Poland.
| Historical place name | Country | Administration | Time |
|---|---|---|---|
| Hammer (Bz. Posen) | German Empire | Bomst | before the Versailles Treaty |
| Kuźnica Zbąska | Poland | Wolsztyn | after the Versailles Treaty |
| Hammer | German Empire | Wollstein | 1939 |
| Waldhammer | German Empire | Wollstein | 1939 |
| Kuźnica Zbąska | Poland | Wolsztyn | 1945 |
| Kuźnica Zbąska | Poland | Poznań | 1992 |