I have looked at this gun also. It is an interesting piece.
This gun belongs to a group of very early hammerless Prussian Dalys that have no makers mark. The serial numbers of this early block of unmarked hammerless guns is in the 1 - low 200s range. I have a my theory of who made them, but it is just that. I do not believe Heinrich Lindner made these guns as he was making some hammerless Prussian Daly guns for SD&G at the time and these guns bear A&D brevete patent use numbers that show they were made concurrently with the unmarked guns. IMO it does not make sense that he would mark some of his guns and not others.
We do not know who made these guns. My best guess, and it is just that, is that it was possibly his Dad, Georg Lindner, a master Suhl gun maker in his own right. I have absolutely no proof. My theory revolves around the age of Heinrich Lindner at the time and the SD&G business relationship. I realize it is pretty flimsy evidence, but when I asked myself the question, "who is the most likely candidate to have brought young Heinrich in on the lucrative Daly work?", my first thought was his Dad. I could go on here, but that is the gist of the theory.
In regard to the Anson & Deeley Brevete mark - they are found on Prussian Daly hammerless guns (both Lindner-made guns and "other"-made Daly hammerless guns) up until approx. 1890. They are always seen in combination with a patent use number showing payment to Westley Richards for use of the A&D design.
The confusing part has always been the use of the word "brevete" (which means patented.) Why is the term not in German instead of French? I don't know enough of European patent law at the time to really comment. And no, I don't think this means they were made in France <g>. I've recorded patent use numbers between 65 - 3000+ on Daly hammerless guns.
Ken
