The Landeron 4750 was the first Swiss electric movement, appearing in 1961.
The movement was developed by the Landeron Branch of Ebauches SA (ESA), Neuchatel, Switzerland…and then named after this branch office.
You’re unlikely ever to see “Landeron” on the dial of a watch containing this movement, and even looking at the movement, you could be forgiven for not making the connection. All of the watch manufacturers listed below used this movement and most have their own name on the movement plates. You’ll need to look through a loupe for the Landeron mark and “4750″ stamped into the base plate:
There are two derivatives of the 4750:
- The 4751 seems to be a very rare movement and adds a hacking feature to the 4750. It does this by the addition of an arm that swings across and acts on a peg on the balance; see the Hilton watch on this site. However, this movement does not disconnect the battery.
- The much more common 4760 takes the 4571 one stage further: it hacks and disconnects the battery.
All three movements are examples of Fixed Coil System, Contact Controlled electric watches. These movements were powered either using disposable dry cell batteries or from an inbuilt accumulator:
The following watches on this web site all contain the Landeron 4750 / 4751 / 4760 movement:
- Hamilton Huguenin Electrics
- West End Watch
A nice group shot of some of my Landeron 4750 / 4751 / 4760 based watches.