Tommie,
I know you’d like some fast answers, and I’ll do the best I can. Pinfire revolvers (as well as shotguns and other arms) were primarily European in origin. They were used in the United States, but most of them were imported. The single largest maker of pinfire revolvers was a company in Paris, France named “Lefaucheux.” Many of this company’s products were marked: E. Lefaucheux INvr Brevete.”
The trouble is, many, many other companies - sometimes nothing more then a family of gunsmiths working out of a small shop, made copies of the Lefaucheux and didn’t mark them with any particular name. These small companies or family gunsmiths were for the most part located in France, Belgium, England, and Spain.
Your gun was proofed (tested) in the country in which it was made, and then marked by the government of that country. Those are the marks you mentioned in your first post. They can be identified through special reference books but I don’t have one handy. You can make a copy of those marks by putting a thin piece of paper over them and then rubbing it with a soft pencil. Then you might be able to find someone at a local gun shop that had a “proofmarks book.”
I know this isn’t everything you want to know, but it’s the best I can do on short notice. If I find out more I will send another post, but other then the picture (which is very good) I don’t have much too work with.