In "The Illustrated Encyclopedia of Handguns" there are two Walman autos in .32 ACP (7.35 mm, in the European vernacular). One is listed as an imitation of the Model 1906 Browning auto and the other as an imitation of the Model 1910 Browning auto.
Two of the three illustrations shown of the former display "Automatic Pistol Walman Patent" on the left side of the slides (the 3rd illustration only shows the right side of the handgun). This is the information on them: "Walman M1914; F. Arizmendi y Goenaga, Eibar. All striker fired." The three illustrated handguns look the same, except for differences in the slide serrations/finger grooves and the length of the grip-frames. The one with the shorter grip-frame is indicated as having a capacity of 7 rounds. One of the others has a lanyard ring at the bottom-left corner of the grip frame. The book "The Triple K Encyclopedia and Reference Guide for Autoloading Guns" also lists this genre of Walman autos with two illustrations of what looks like two of the three shown in the other reference. This book indicates that one of them was "Made by Arizmendi and Goenega." Triple K makes magazines for the two that they have illustrated. The general lines of these pistols look very much like those of the Colt M1903/1908 Pocket Hammerless auto, if you're familiar with that small auto pistol, except the slides and barrels are a little shorter. This Colt was also a John Browning design (his auto pistol designs tend to look alike, although they are different internally.)
The Walman auto that's an imitation of the Model 1910 Browning does look like a very close copy of a Browning Model 1910, except that the barrel and slide is shorter and the grip-frame is slightly shorter. This is what the book says about it: "Walman; Arizmendi y Goenaga, Eiber. 7.65 mm Auto. Seven rounds. Striker fired."
All of the illustrations have the name "Walman" near the top of what looks like plastic or hard rubber grip panels. Eiber was the center of Spanish gun-making prior to WWII. During this time there were reportedly over 300 gun manufacturers in Spain, mostly small, and the Walman autos were evidently a product of one of those. My very limited reference on Spanish proof marks shows one similar to yours, a crescent moon lying on its "back" with a star above it and in between the two are the letters "PC". Says it's an Eiber proof mark used since 1910. I don't know why a German general would be carrying such a gun but the Germans had a very close relationship with the Spaniards during and immediately prior to WWII, having supported the victorious Franco in the Spanish Civil War in the late 1930's and it is well known that the Germans, once they were under duress to supply their military machine when the war really got under way, scarfed up many different types of auto pistols from a number of sources. It's also possible that the Walman that the general had was a personally-acquired sidearm.
Age would be manufacture prior to or, at the latest, during WWII as the Spanish government shut down all but a few handgun manufacturers in the country during or around WWII. The Model 1914 Walman would, of course, be no older than that date and the one based on the M1910 Browning would be later than 1910. The value on these guns is low, having attracted almost nil collector interest, there were literally scores --- if not hundreds --- of similar small auto pistol models made by small to medium-sized gun manufacturers in Europe during the pre-WWII period, many of the handguns being of mediocre or poor quality. The Triple K book quotes a retail value of $125 "in average condition" for the Walman .32 ACP autos illustrated.
Thank you Rev for very useful info.
I have a Walman pistol in 7,65mm with no other markings than AUTOMATIC PISTOL WALMAN PATENT on the left side with the "star" underneath. Serial number on the frame : 19543.
And on the right side all it say is SPAIN.