If it's a Ruby then it's the standard .32 auto acp. The round that the Frenchicon used was did not come about till the mid 1930's and is called the .30 French long. It is longer then the standard .32 auto. The French Ruby was made in Spain by quite a few different manufactures all making the same gun. Originally it was one company who had the contract but they could not make enough so to start they had different companies making different parts and then the first company would assemble them from all the different parts but too many were not made correctly so they all made a version of the Ruby and all were sold to the French military. The gun post war was sold commercially too under different names. Not all magazines interchange. I don't think anyone knows just how many different companies made this pistol. Some of them are unknown and may have been cottage made.