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Jonny69-
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
Haha, yes, that's definitely Flanders signature. ;)
You should build it and come to Belgium to ride the "Ronde van Vlaanderen" hills near Oudenaarde and visit their shop. Nowadays it's Ronny who runs it (Frans died some years ago and Luc retired).