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The dark paint scheme seems to act as a black hole for photographic light on this, hence the really quite crap pictures, but this shot from the Chesini website gives you a better idea of the profile of the tubing (if you look at the lighter section in the middle of the top tube, which is then flanked by darker sections to the top and bottom, it might give you a sense of what I'm on about)
Any clearer pictures of -
octagonal cross section & nice panto work to the seat stays and head tube.