M. Janovitch & Co. started in business in the mid 1920s, they were then retailing ferrotype supplies and cameras. Around 1930 they brought out their own Postcard Camera. This used a two stage process, first a negative was obtained on normal bromide printing paper this was then re-photographed, again on bromide paper. The large box was effectively a combined camera and darkroom. Behind the lens was a panel holding a focusing screen, the panel could be moved by rack and pinion to focus. At the bottom of the box were two trays containing developer and fixer. Access was through a sleeve in the back of the box through which the operator could insert his hand. On the top of the box was a window with red glass that could be covered by a shutter, the operator could look into the box through an eye-piece with a slide holding red or clear glass. On the front of the box was a hinged arm that could be brought in front of the lens, this held the negative to be copied.

To take a photograph the operator would open the rear door, or peer through the eye-piece, and compose and focus the subject on the ground glass screen. Having closed the door he would insert his hand through the sleeve and put a piece of bromide paper in front of the screen, which hinges to allow this. The paper is stored in a compartment at the top of the camera. After taking the exposure the paper negative is taken from behind the screen and put in the developer tray and then the fixer tray, this can be observed by opening the red window in the top of the camera and looking through the eye-piece. The negative is then removed, rinsed, and clipped into a frame attached to the arm on the camera front. The negative is then photographed. For this, the focus is pre-set, the focusing screen is pulled right back until it reaches a stop. Ordinary photographic paper was used, for the negative glossy normal was recommended, and contrast grade for the positive.

The camera was advertised as a 'portable studio' able to produce black and white prints in under 5 minutes. "Suitable for the tourist trade, garden parties, fairs, seaside resorts".

Early models of the postcard camera had the developer and fixer held in a tank underneath the camera, this changed to the tray arrangement around 1954. A Junior model for 3 ½" x 2 ½" prints was briefly advertised around this time. Around 1951 the name of the company was changed to Jano Camera Co.