This is an original, period-correct protective case for Hasselblad film magazines. In a professional workflow, a photographer would carry several film backs pre-loaded with different types of film (such as color, black and white, or high-speed film). These rigid leather cases were designed to protect the delicate mounting surfaces and the dark slide of the film magazine from dust and impact while in a camera bag. It features a belt loop or strap attachment on the back and a secure snap closure.