The Coronet D20 Box was introduced in 1937. It is similar to the model B20 except for the following: Big, flip-up viewfinders; Square format (12 images sized 6" x 6"); Stamped geometric decorations; strap lugs on the top of the camera. Two aperture choices (f16 and f22) with a fixed shutter speed, plus bulb mode. Both aperture and shutter speed are controlled by pull-out switches above the shutter release lever. Accepts both 120 and 620 rollfilm. Made in England.