Because 35mm film originated as a stock for movie cameras, a large fraction of its width is taken up with sprocket holes—not a requirement in a stills camera. Thus, Eastman Kodak introduced an alternative "miniature" format, 828 film, consisting of paper-backed rolls 35mm wide, but having only one registration hole per image. This permitted an image area of 28×40 mm, increasing the image area nearly 30% compared to standard 35mm. Kodak re-used some ideas from the 828 format (paper-backed film 35mm wide with only a single index hole per frame) in their wildly popular 126 cartridge, introduced in 1963 with Kodak Instamatic cameras. Camera-wiki.org
The Bantam F4.5 camera was manufactured by Eastman Kodak Co. from 1938 to 1948. It was a popular camera due to its ease of operation and compact size. The camera was constructed with an aluminum body covered in black morocco-grained Kodadur material and is a pop-up strut folder with a billows. It was capable of capturing 28mm (1.1 inches) x 40mm (1.57 inches) exposures on type 828 "Bantam" film. It is fitted with a Special Kodak F4.5 coated Anastigmat lens with stops down to f16. The body and linkage released manual load shutter provide speeds of 1/25, 1/50, 1/100, 1/200 of a second, plus bulb and time. There was also a socket for a plunger shutter release that you had to remove a screw (in place for a light seal) to use. The camera measures 11.43cm (4 ½ inches) x 6.98cm (2 3/4inches) x 3.81am (1 1/2 inches) when folded and weighs 9 ounces. The Bantam F4.5 camera was priced around $40.40 with an optional leather case for $5.50. The top models in the Bantam series were outfitted with f/4.5 Kodak Anastigmat Special lenses. Some of this information was gleaned from camera-wiki.org and Historiccamera.com.