Here is a chart giving some guidance. It is not complete in detail by any means as there appeared to be variations with some rifles made on certain dates having different styles of chequering and also the multi groove barrels popping up on later rifles.
As already posted CZ took over from the BRNO company of the Models 1 and 2s around 1967. BRNO engineers continued for a short overlap. The original BRNO company ceased to exist although that is murky too. CZ did initially use parts left over from BRNO. There was a decline in quality for a period after CZ took over. The later years saw improved quality and the likes of the 2e is a fine rifle.
The rifles continued to display the BRNO moniker even though they were being produced by an entirely different company. This was some commie govt thing I think. Again, that period was pretty murky to the outside world.
So, when someone lists a rifle say for example dated 1987, on Tardme claiming it to be a BRNO it is not, it is a CZ. Likewise I have seen the odd Zastava listed as a BRNO.
One of the worst rifles I have owned was a 455, I got a real lemon. One of the nicest rifles I own us a BRNO Mod 1.
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