Landeron Caliber 4750

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.