I'm with JC and M. Gournet on this one. It would appear that either the "Regina" is not a Charlin product or, if it is, it certainly wasn't the only gun they were making. Looks to be the catalog of a gun dealer in Bordeaux. In fact, the language of the 2nd page--about the Charlin--pretty much verifies that: "nous nous sommes assures la representation" means that the source of the catalog is a Charlin dealer or retail outlet. That wording means, without doubt, that the catalog itself could not have come from Charlin.
The photo of the 2nd page isn't quite as clear, but goes into great detail about the advantages of the Charlin, the kinds of patterns it will deliver--and how many pellets in a partridge or a hare.
Reference the Charlin: "In summary, this shotgun--absolutely without equal--is a weapon that possesses all the improvements one could possibly ask for in a shotgun."
I'd also note that the other gun, the Regina, is sold with a two week trial period, and is guaranteed against any material defects for 2 years.
Interesting discussion, gentlemen!
