Yeah,
I used a flashlight and didn't see any rifling inside the tube. But the seller insisted that it does have ridges and had an "expert" verify that. But I'll take more pictures later tonight. It is a nice frame, but I did buy it thinking that its an SLX frame too. And the newer looking Columbus SLX sticker over the "tan markings" of the older sticker gave me a lot of doubts. But I'm wondering, is it possible that Colnago made a Superissimo frame with SL tubing? The 88 catalog online shows that Superissimo was built with SLX tubings.