I suspect this unusual piece might also be from Besançon, home of the hollow star: A Zenith-branded Martel Cal 1111.
very interesting! You know, nastrucjowa, you really ought to start a new thread for the very nice pieces you are posting. They will be much easier to find that way in the future than to dig though a thread with a nonspecific title.
Very nice desk clock. Antiquorum sold one last week for $3400 (before buyer's premium). I think that one and yours are the only two I've seen outside of Rossler and yours is in excellent condition.
J-Luc, I love these old Italian air force cockpit clocks, and I haven't seen that one before Here's a Universal version
Forget the puny 57.5mm Type 20 Montre d'Aeronef reissue. The original full-size model is the only way to go.