Contrary to Walter's assertion, the Campagnolo Cambio Corsa on this Gitan is actually not the earlier variation. The early, pre-war (WW2 that is) model was developed in the 30's, along with the quick release mechanism (in partnership with the Ambra Superga F-B hub). Both the hub and Cambio Corsa gear quick releases had round section handles with a pair of knurled rings on them, and were marked Campagnolo Vicenza. After WW2, that design was changed to a flat section "paddle" shape with the popular "jeweled" casting and "Campagnolo Vicenza" cast prevalently on the face, outlined in beaded filagree (a design that was to last nearly 40 years with only cosmetic design variations).

The early round section variation is as rare as hens teeth, and I have only seen two in my short 50 year life, and one of them was in a photograph in CycleSport last season. Based on this observation, assuming the gear system is original, the bike is definately a post-war model, and not a 1938 machine. I did not get a private email from TOC, but could probably help himto narrow this down with more details (such as componentry markings, etc.).