Cap badges of the VOKhR

[Kim]

Here are a couple of cap badges from the BOXP- voenizirovannaya okhrana, armed security guards. From what I learned of the Internet the VOKhR is one organisation but with a great variation in tasks. Some VOKhR guarded prisons, camps and some industrial complexes. But they must have had different uniforms or at least different models over the years. Information one the subject is next to non-existent. An Internet search gives a couple of cap models, not much more. Does anyone have more information?

To the left are two badges m/1982 and to the far right one m/1956.