Pocket watch ‘Cylindre 10 rubis’

I bought this watch on eBay, state to be a pre-WW2 pocket watch.

It does not run and the main spring appears broken.

But- it is in a repairable state and everything moves easily.

Most importantly- it has not been tampered with.

In my search for similar watches i could not find any with identical inner mechanics, all watches that appear to be alike have different gears and so on.

I will update the repair later.