The International Organization for Standards (ISO) has a ISO 4217, which delineates currency codes, country codes, etc. for, well, international currency.
Alongside this, each country is given a three-digit numerical code number. I've been trying to figure out what kind of designation process this has, but it appears to be random. Why is it oddly (mostly) random?
They appear to somewhat progress alphabetically with new ones added to sometimes newer countries that appeared after the 1973 designations, but not always. And there are way too many gaps for those countries that may have fallen off the map since then, so to speak. What is the meaning of the numerical designation for ISO 427 labels on currency? I find it hard to imagine it is just sloppiness.