Some time ago a got hold of a Pirofa made by Pierre & Robert Fontaine in Nantes, who were in business there during the 1950's and 1960's. They are the second maker I've come across in Nantes, the other being Arvor. The Fontaine's seem to have closed down by 1970, and the brand, along with Arvor, is now registered to Michel Epenoy SARL, founded in 1972 at rue Victor Hugo, Besanēcon, and it's manager Cedric Epenoy, who also has a small watch business at the same address.
This one is from the mid to late 1950's, with an ETA 2391 series 17 jewel movement:
Today my second Pirofa arrived from Barcelona, this time from the 1960's, with the ubiquitous 15 jewel Cupillard 233-60.