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It's Columbus but not exactly Gilco. Gilco S4 tubing was designed by Gilberto Colombo exclusively for Colnago (and produced by Columbus - Antonio Colombo is a relative of Gilberto). In that meaning all other crimped tubing isn't "Gilco design" but just Columbus. I have a Carrera with the same crimped tubing and that is labeled "Columbus Nivacrom".
WimVDD
So is that Columbus Gilco tubing or something else which they crimped themselves?