Marc Boral mentions that all Superissimos he's seen have flat caps. However, there is a Superissimo on ebay right now, all original, already outed on this list, that has fluted caps I believe. The owner sent me additional pics and I think there were fluted caps...but, to be honest, now I can't recall.
I *have* seen at least one Superissimo frame that had fluted caps. I suspect the earliest Superissimos (the ebay Superissimo is one such) had the fluted caps, and later ones did not.
I thought our list-member Johan did a nice job of elucidating Colnago's policy in 1979 and 80. You could custom-order just about any darned thing you wanted. Graphics, finish-details...this kind of thing can give a collector fits, of course.
Charles "too many 'nagos and I love every one" Andrews Los Angeles