This was a strangely disappointing derailleur for a company that could be as innovative as Huret. Sure, it was strongly and accurately constructed. Sure, it was decently finished. Sure, it was very much in the style of the best selling derailleurs of the time. But, in 1940, it was essentially a copy of the 1935 Simplex Champion de France. You could possibly argue that it was even a tiny bit cruder than the Simplex Champion de France.
Perhaps it was something to do with the impact of the Second World War. Perhaps Simplex had gone into hibernation or, because of 'supply chain issues', could not churn out enough product to satisfy demand. Either would open a window for Huret to prosper by producing a, rather unremarkable, me-too product.
Some key features of this example may be: