This is the only known prototype Walther 9mm Ultra pistol. It and its cartridges were developed by Walther for the Luftwaffe. The intent was to design a pistol that retained the compact size of the PP-PPK design but employing a cartridge intermediate in power between the 9mm Kurz and the 9mm Parabellum. Approximately 25,000 rounds of the unique 9mm Ultra ammunition were manufactured by Gustav Genschow & Co. in the early 1940s, with most of it either used during testing or destroyed.
