It looks to me very much like an aeronautical non-directional beacon. Post the exact coordinates of where it was, and no doubt someone will look it up in the French AIP. Keith G3OIT I agree with Keit
I have seen two different models at Hamradio in Friderichshafen. One was German, the other Swiss, s these things are available 73 Rag LA5HE Ah, you evidently missed the relatively brief period of a f