The Hasselblad 500C/M was the third medium-format, single-lens reflex camera (SLR) designed and produced in Sweden by Dr. Victor Hasselblad. Designed to capture 6cm x 6cm square images on 120 (12 exposures) or 220 (24 exposures) roll film.
See Dan Rubin shooting with a Hasselblad 500cm in the video below:
And another video with Braedon Flynn and Dan Rubin both shooting Hasselblads comparing different Kodak black and white films:
Part of the uniqueness of the Hasselblad 500-series camera is its modular design. The camera consists of a body fashioned from a single block of nickel-alloy, a lens, a film back, a folding viewfinder (or optional prism finder), and a film crank, each of which is interchangeable with almost every Hasselblad 500-series camera produced from 1957 through 2006, when the last Hasselblad 500-series camera was hand-assembled, in 2006.