Very nice! Never seen one. It's a variation of ATO clock for which there was many different brands.
ie: Bulle, Hatot, (from where we get ATO to describe this type of clock), Kundo, Junghans, etc. Search the forum here and you'll see other examples.
I'd like to see a picture of the back without the shroud, if it's convenient.
I would say its quite rare and fairly valuable.