The one in the picture looks like one of the mild steel skank frames, to be honest with those pictures the only thing that gives it away is the multi coloured decal. I think they were made in the 80's maybe early 90's and this is the first i've seen outside of Asia. i guess it wasn't going to take long for somebody to find one or two and start selling them off as the mcCoy. One of the Asian dudes on VBMX had one he'd found, old stock, hanging in a local bike shop. Once he posted his a couple of the other's from that neck of the woods said they'd seen them too.
All you'd need is a close-up of the welds to see it isn't Alloy.