This is an exceptionally rare and probably a "one-of-a-kind" Walther first developmental stage Model MP with the concealed hammer design with all the very early Walther pistol designed parts. This example is the forerunner of all Walther MP/PP, HP, and P-38 designed pistols. This was the first true Walther double action type semi-automatic design. The serial numbers of this series started at 1000 (or 1001) and this example is number 1002. It has all the very early features such as the complicated two-piece, dual locking block designs (one on each side of the barrel lug) with the locking lugs machined into the upper slide rail, the early slide design with the dual reinforcing ribs on each side of the slide with the machined lightening cut in the center of each rib, the "single" long one-piece slide release/takedown lever, the longer rear frame, slotted on the underside for a shoulder stock (different than the Walther AP designs), no slide bridge and the one-piece full length, machined firing pin cover with the internal firing pin block/decocking lever on the side of the slide. It has an all machined frame with an all machined unmarked Walther magazine. It has the early style fixed front and rear sights. The left side of the slide is marked on the top rib with: "Waffenfabik Walther Zella-Mehlis (Thur)" and on the lower rib: "Walther's Patent Cal 9 m/m Mod MP", with the "WALTHER" banner in the center cutout area. This wonderful pistol is fitted with a set of two-piece wrap around, checkered walnut grips with full length checkering on the sides of each grip panel. This is a truly unique early Walther prototype pistol.