This is a Shalco HIT-type camera, with case, original box and instructions. Very nice.
As with many of the cameras in the collection, this HIT :
has a single shutter speed (1/30th sec)
has a fixed-focus 30mm lens
has a fixed aperture (f11.0)
uses 17.5mm paper-backed film (producing a 14x14mm image)
The Purma Special was introduced in 1937 and manufactured until 1951. This was a particularly unusual-looking bakelite camera, featuring a unique shutter and lens mechanism. The lens was spring loaded, being pushed back into the camera when the lens cap was replaced; preventing the photographer from making an exposure whilst the cap was on.
The Purma Special takes 16 1.25 inch square photos on a 127mm film. Two red windows on the rear of the camera are used to align the frame when advancing the film.