CJ750/M72 toolbox
M72 & CJ regulators comparison by Lutz Kraus

The first CJs were built using Soviet M72 regulators. Early Chinese-manufactured regulators were copies of the M72 regulators which later evolved into those we see today.

A pair of older M72 regulators.
The back panels.
This is a Type III M72 regulator.
A typical Chinese regulator.