Concerning the crossed swords/X on the cheap mags, I just talked to Wideners and they confirmed they will not have have the cross and they "think" they are military surplus but no indication of country of origin. They even indicated they won't work in an 83 (not sure if that is true.)
Since I am new to my CZ83, with only the mag that came with it, I have no clue beyond what they told me, so heads up.