Military belts and how to find out the name of the buckle part

I have a leather belt for casual dress use, with a military style belt buckle. It locks the belt by friction. I really like it and would like a couple of more belts like it in other belt colors, but could not find it on the Internet. I had no problems finding ones with the correct kind of buckle but where the belt wasn't leather.

Until I realized that you need to know the exact term to describe that kind of buckle. At Baron Belts I found the term "slip-through with friction pin", but that did not help much, since that term did not seem to be in common use to describe the finished product. Wikipedia to the rescue: On their page on belt buckles one can find the term "Box-frame buckle". And that is what one has to search for: Box-frame buckle. And there are some very nice leather belts indeed.