YouTube user JManTime posted up a video on a very unique firearm from WW1 that I would contend that our own Ian from Forgotten Weapons would not know its provenance. The design is a mechanical marvel, if only for the complexity and sheer number of parts that go into the design.
The firearm is housed at the Tula State University Museum in Russia, which only recently released the photographs of the firearm. Full video below from JMan, but it includes some insightful commentary on the design, features, and likely intended usage of the firearm.
Description from the video:
Forgotten German World War 1 Submachine Guns
In 2014 the Tula State University museum in Russia released photo’s of a Mystery German submachine Gun from World War 1. It might have been captured by Russian Forces during the war. During World War 1, the imperial German military designed at least 7 Submachine Gun prototypes, with the Bergmann MP-18 being the only one adopted by the military in 1918. This Submachine gun seems to be based on both the MG 08/15 and the Danish Madsen machine guns. No one knows how this weapon ended up in Russia, but it could have been captured during the Romanian Campaign of 1916 – 1918, but that’s just a guess.
Book – G. de Vries, BJ Martens: The MP 38, 40, 40/1 and 41 Submachine gun, Propaganda Photos Series, Volume 2, Special Interest Publicaties BV, Arnhem, The Netherlands.First Edition 2001