BRNO's varied in (mainly) quality of finish.
Somewhere in the 70's there was a reduction in quality of metal finish (down to somewhere like the CZ's of today).
It is mainly the earlier BRNO's that are much sought after. They have proven to be totally reliable - only professional rabbit shooters wear out their BRNO's (and now CZ's) - so much so that (early) second hand BRNO's command a price similar to a new CZ 452 and are often purchased in preference to a new rifle (if their condition is "good" or better).
I am enclosing a close up of my BRNO Model 2's action and part of the barrel in which you can see the depth of the blueing and the polished surfaces. This is a 1967 example. That is a CZ Magazine in the magazine well, BRNO magazines are all metal and closer to a flush fit.
Note: The surface of the action is not smooth and therefore looks "matte" but is still deeply blued. I think that the depth of blueing and level of metal finish can best be seen on the Iron sight block and on the trigger guard - I had a lot of difficulty getting the metal to NOT look dull in the photos.
I understand that the Model 1's and the Model 5's had smoothly polished actions.

PS: I don't have a wardrobe full of these to show off, just my little rifle to impress with. And can I be adopted too, Mr Dancz?