Recently I bought 20 or so of various vintage watches. Among them was this Pronto Verdal watch. Google did help a bit, but not enough. I am interesting in any onfo on watch, brand or movement. Is it French or Swiss? Any brand history and possible relation to Tour de France? And what is the movement name. As you can see, it has inscription 15 751 and it is cca. 23 mm in diameter, so I guess it is 10.5'''.
Thank you in advance:thanks