My Italian is.. well I know very little Italian, but the decal states: "acciaio cromo cyclex" and " forzi elicoidali" along with special super butted.
I know marinoni mixed a lot of different tubing types together so I'd take the decal with a grain of salt anyways. the buckling is very slight on the top tube (barely feel it), the downtube you feel it a bit more, as you actually due notice it, its really not evident by eyeballing it on either tubes.