Breaking my own word here and jumping back in. CERTIFICATION and STOCK NUMBER are two different things, NATO apparently looked around, saw CZ survived some torture tests mandated by Czech police and then decided "OK this looks like one we want" and decided to use it. In order to do that, same as the US army, they stick a stock number on it. Call it a BAR CODE like a can of peas on a shelf. To make sure you get what you want off the shelf, you have a stock number. NATO did not certify or torture test it. They CHOSE It AND THEN GAVE IT S STOCK NUMBER. I think putting that number on the pistol itself seemed a good marketing idea to CZ. That is my rational and thought upon reading and listening to folks on this matter.
Also, any product, no matter how good, gets EC's - Engineering changes. I have no clue as to CZ motivation. Maybe they just responded to little things needed as opposed to not tweaking it. And, for all I know, not putting that number on it may have need a function of an OOPS at the factory. May be someone said "Hmm... minor change.. before we stick this number back on it we better check (no pun).. but demand is so great, lets ship these now with no number as opposed to waiting". No clue. They run a business. They do not need to cut quality in these times to make more money.. Look at the prices. I got to go to work now....