Nngh!!... Mystery... Gun... Can't... Resist!!
I dug through A.B. Zhuk's encyclopedia (usually a very fine source, if you have a mystery gun), and I found a pretty precise match -- visually speaking. A "Brong-Grand" by "Crucelegui Hermanos" of Eibar -- Spanish, in other words. It's number 1144 on page 154 of the newer edition, if anyone has a copy and cares to take a look.
The "palm frond" looking carving at the top of the grip plates, and the rear site being cast into the frame in that shape and position give the game away. No idea what the proof-marks are all about, but I know that in Britain it is, and was, standard practice to re-proof any guns coming into the country to Brit standards (Spanish guns of the early 20th century often failed this test, BTW). Perhaps France and Germany had a similar practice, accounting for the varied proofmarks?
Oh, and the "CAL 765" means that it's chambered for .32ACP, in case you were wondering. "7.65mm" is the European designation for .32ACP.
Your type of gun is a sub-class of pocket revolvers from the "Puppy" or "Bulldog" class. At the time they were made, small, blowback semi-autos were quite fashionable, but were often accused of being unreliable, so some enterprising spark decided to make cheap revolvers which superficially aped them. That's why they look so squarish, chamber semi-auto rounds (like .32ACP and .25ACP) and often have pointless safety catches. Revolvers with these features were made in Belgium, Germany, Italy and Spain (undoubtably elsewhere, too). You will find some "Velo-dog" class revolvers also sporting these features, but "Velo-dogs" should (strictly speaking) be chambered in 5.5mm Velo-dog only. A good deal of overlap occurs in these classes, however and you can find countless hybrids and variations.
Got all that? Good. I'll be setting a test at the end of the lesson...