Hi,
I picked up a La Spirotechnique with a Rue Cognac can. It only has 3 digits in the serial number (255) and am wondering what year it was produced. I read on the French Frogman site that the can address for La Spirotechnique can give you an idea on the age much like on US Divers:
(http://frogmanmuseum.free.fr/html/deten ... iquefr.htm)
* Rue Cognac Jay, Paris VII - jusqu’en 1956
* Rue Trébois, Levallois( Seine) - jusqu’en ??? (mais au moins 1962)
* Rue Marius Aufan Levallois (92).
Can anyone suggest a source of information on dating this and other French regs?