| Manufacturer | Landeron |
| Caliber Number | 4750 |
| Type | Electric |
| Lignes | 11.5”’ |
| Jewels | 12 |
| Vibrations Per Hour | 18,000 bph |
| Anti-Shock Device | Incabloc |
| Functions | Central hours; central minutes; central sweeping seconds |
| Country of Manufacture | Switzerland |
| Known Models | Wittnauer Electro-Chron, Bucherer Electric, Enicar Electric, Nivada Grenchen Electric (Add your watch to the comments below…) |
The Landeron caliber 4750 was the first Swiss made electric watch movement. This caliber was launched circa 1960 ~ 1961 and is found in a wide variety of vintage electric watches from the 1960s. There is a similar Landeron caliber 4751 with 13 jewels.
The original battery was numbered WD-4 or WD-5 and contained mercury. For that reason, the battery is no longer available. Some folks use smaller diameter modern batteries with an adapter ring. If you have experience with this, please share in the comments below.
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