Challenge International de Tourisme 1929
The Challenge 1929 was the first FAI International Tourist Plane Contest (French: Challenge International de Tourisme), that took place between August 4 and August 16, 1929 in Paris, France. Four Challenges, from 1929 to 1934, were major aviation events in pre-war Europe.
Source: Wikipedia — Challenge International de Tourisme 1929 (CC BY-SA 4.0)