NN was formerly part of the German Empire. In the German Empire, the place was called Hammer.
The place is now called Kuźnica Piłska (Piła-Kuźnica Piłska) and belongs to Poland.
| Historical place name | Country | Administration | Time |
|---|---|---|---|
| NN (Hammer Werk) | German Empire | Deutsch Krone | before the Versailles Treaty |
| Hammer Werk | German Empire | Deutsch Krone | after the Versailles Treaty |
| Hammer | German Empire | Netzekreis | 1939 |
| NN | Under Polish administration | Wałcz | 1945 |
| Kuźnica Piłska (Piła-Kuźnica Piłska) | Poland | Piła | 1992 |