According to Wiki, these have a grey zinc phosphate finish and also had some that had a darker parkerized finish. Other stuff I read says that the blued finish is a re do at the arsenal. The thing here is that there are some un issued CZ-52s that have both finishes - your choice. The bore is brand new, the rollers are perfect and the guns look new. Would they have refinished new guns? could it be that maybe they made some for parade dress or special regiments with a darker(more expensive) finish? Does anyone know?
If it is original, i would love to have 1 or 5 of these.

