| Manufacture | Excelsior Park | |
| Société | Jeanneret-Brehm | |
| Lieu | Saint Imier | |
| Calibre | 1 | |
| Diamètre | 43.00 mm | |
| Hauteur | 7.00 mm | |
| Epoque | 1915 | |
This calibre is available with several frequencies and graduations on the dial.
The example in the photo shows a dial graduated up to 10 seconds and a small balance on the movement, beating at 108,000 vib/h.
