You got itRobinson SR-11
The Robinson S.R. Model 11 9mm Machine Pistol, also known as the SR-11 or Robbie gun, was an Australian machine pistol designed by Russel Robinson in 1943 and produced by the Lithgow Small Arms Factory in prototype form only. The SR-11 was designed by Russel Robinson, an Australian designer who...guns.fandom.com
Robinson R-11 machine pistol prototype from Australia, 1940's.