Hi Gustavo. My father was from Skovde, my mother's parents from Varmland, so I have been to Sweden several times, including Stockholm, and drive Volvo's (I have 3) and even have a Crescent road bike. Most high end Italian bikes came with Columbus tubing, forks and stays, since Columbus is an Italian brand. Many high end French, British, and others were built with Reynolds tubing, which is a British brand. Of course there were exceptions, especially many high end bikes built outside of Italy were made from Columbus tubing. Then, there are different "grades" (quality) of both types of tubing, Such as Columbus Cromor, SL, SLX, and Reynolds 501, 531, 753, etc, which is why it is nice to be able to read the tubing decal on an individual bike to get that info. However, sometimes just knowing the model of bike and the period it was made (date of manufacture) will tell you what the frame material was. Good luck!