Klaus-Peter König and Martin Hugo, in their book Taschen Pistolen, state that the WTP was patented in 1918-we assume
We would be grateful to anyone who can locate this patent. We have been unable to locate the patent for barrel retention, possibly because it is not under the Heinzelmann name (Weaver, Speed, and Schmid state it was patented by a company owned by
Mauser’s need to fulfill military contracts during World War II. It appears to have been discontinued before the end of 1940 due to Most sources state that the WTP II was first made in 1938, though the 1937 Geco catalogue already has it listed. There are two distinct types of WTP, known as the WTP I and the WTP II. WTP is the abbreviation for Westentaschenpistole, or vest pocket pistol. Mauser Pistolen is the only source that references Heinzelmann in relation to the WTP. The patents for the Heim pistol were filed in 1924 and granted in 1926, but none bears any relationship to the Mauser WTP. It carries the company’s name on the slide and appears to have been made for a short time in the early 1930s.” The Heim pistol does not use the same barrel removal system as the Mauser WTP. “Heinzelmann made the Heim pistol, a 6.35mm blowback automatic that externally resembles the Mauser WTP, but internally, is closer to the Browning 1910 with a fixed barrel and a coaxial return spring secured by a muzzle bushing. Weaver, Speed, and Schmid, in their book Mauser Pistolen, state: “Instead of designing a new pistol, Mauser simply bought the rights to an existing simple blowback design, with aīarrel removal system patented in 1917 by a company owned by a C E Heinzelmann of nearby Plochingen am Neckar.” They reference Hogg and Walter’s Pistols of the World, which states: (known as vest pocket pistols) and, as the end of World War I drew near, the Mauser company decided it was time they manufactured one. The Mauser Model 1910 in 6.35 mm Browning was by any measure a remarkably successful pistol, but the 6.35 mm Browning cartridge was originally designed for the smallest of personal protection pistols
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