The Hasselblad A16 Back holder is the backbone of a Hasselblad medium format setup. Unlike the A12 can the A16 create 6x4.5 ratio exposures. Which allows you to put more exposures on a medium format roll.
Type II Introduced in 1970 and continued to provide support for older Series One and Series Two cameras. The “A” stands for “Automatic”, which stretches as far as allowing the film to be loaded up to a start mark on the film insert and thenautomaticallywound on to the first frame without the need to peek through a port like their predecessors.