Though unbranded, I think this is a Minerva single pusher chronograph with what looks like a 17j manual winding movement.

Circa 1930’s.

Case measures 38mm without crown.

20mm Hinged lugs.

Original multi colored dial with KILOMETRES A L'HEURE track measuring speed up to 300 Km/h.

Subsidiary dials for constant seconds and 30m register.

Very attractive and fully functional.