Charlin was around a long time, but was purchased by the Darne company around 1955-a lot of French makers went bust around then. I seem to recall the company being founded in the 1890s

The Darne company quit producing Charlins and the P model Darne (a gun similar in operation) in 1965. I have two Charlin catalogs, they are both printed in French language, and appear to be from two different eras of ownership, (I can't document who owned the company at what time) and taste-one catalog features art nouvo and almost Celtic style engraving, the other, more typical game scene and scroll type work.

Charlins are interesting guns, and had some interesting features and patents-a full stainless steel action was available, as was a hollow ventilated rib.

Many people, here, and in France, consider the Charlin a better design. I'm not in that camp. I prefer an original R Darne, either the 1894 or 1909 patent, to anything else, including V or P model Darnes. Just my preference after using just about eveything sliding breech out there. Stock measurements on a Darne seem to be critical, and most people don't own a Darne they ordered new, so they are shooting someone else's gun. Hence, the guns have a so-so reputation in the field. But, if you find one that fits, and learn to use it, they are efficient bird guns, comparable to any other design.
Best,
Ted