My MZ-2 is comparable to the MZ-2 in this auction. I have two MZ-2s, none of which have paint problems. If anyone is interested, mine also includes the original box.
I have one in my collection and another on-deck.. both are 9/10 - with a little chip on the top right corner (just above the knobs). I think the finish is maybe a little thicker, prompting any chip to peel a match-head size portion off. I also think it's one of those finishes which is sprayed on the bottom edge.. (many of the flake finishes seem to be).