The Kodak Duaflex is a 620 roll film pseudo TLR made by Kodak in the US and UK (Year: 1955-1960). A pseudo-TLR is a camera that imitates the look of a TLR (twin lens reflex). It is simply a large reflecting type viewfinder. Duaflex IV is modified to accept the Kodalite flash holder. It had an aluminum-alloy body and a simple fixed focus 75 mm f/15 Kodet lens.
A special feature of the Duaflex line was double-exposure prevention, meaning the advance knob had to be turned to the next exposure before the shutter could be activated. This feature could be overridden by pushing the little lever below the shutter button.