foversta[PuristSPro Moderator]
20814
Zenith Montre d'Aeronef Type 20 - Small - Big - Bigger...
3 Aeronef Type 20... from 40mm to 57,5mm....
My fav version is the GMT with its 48mm case.
Sorry for the "blued" dials of the first two pics due to the light conditions.

Fx