Of course I know the Cortébert Village, but what I meant by 'French Company' is that that Cortébert was founded by the Juillard family which were made a noble under Louis XVI one year after the French revolution in 1790.
For the Jump hours, well I have re-read 3 sources and they all agree in saying this was the first known Jump Hour (pocket watches). Now I am going to search more, following the references you kindly provided us.
You are right my initial and continuous search is about mechanical digital wristwatches. This far I am finding a lot of references from the 50’s (electronically powered) and late 60’s (digital/jump hour)
Many thank for your help and reply.