1938 - 40's Zeiss Ikon Ikoflex III / II is a pre war TLR (6 X 6cm
in 120 film) with a Zeiss Tessar f3.5 / 75mm lens in a Compur-Rapid
shutter. Shutter speeds and F stops are set by levers under the taking
lens and has two viewing windows above the viewing lens for F stops and
shutter speeds. Double exposure prevention.