This is not mine but a photo I found on the net that just goes nowhere. The photo remains but any background information is gone.
I found three of these today at an antique shop and purchased one with of course the plan of filling it with the appropriate pistol I simply do not know what it is. Now that I'm home I may be able to find some information on it as I have better luck with a computer than a cell phone
I was leaning Bulgarian but that didn't pan out. I will try various pistols and magazines that I do have to see if any work/fit.
I do not have the belt. It clips onto a special belt as shown with two brass clips on the back. The belt has those D rings on it which the clips attach to. You can see one in the photo.
https://www.milsurps.com/images/impo.../D0Bkvdj-1.jpg