Hasselblad 70mm back that has been modified by Mercury Works to take all types of film, including 65mm, 70mm perf, and 70mm non-perf.  The back has been CLA'd and tested, but will show signs of use, including scratches and scuffs.Because we encounter many broken backs, we sell them at a discount in several conditions. Factory Functionality: The back works like it did when new, except for being compatible with more types of film. Our current back, however, is in "ugly" condition: battered, with a couple of rust spots, and some engraving.  However, it has been film tested and performs perfectly, unlike the vast majority of vintage A70 backs! Manual First Frame: When first loading the back, wind until the side window turns white for the third time and turn your frame counter to "1".  For all other frames, the camera will wind the back normally.