Thanks T-Mar.
I will check it up during the weekend. The saddle is the only thing so far that I have found any date code on. "78" followed by all the months, and a mark for "Jun". I will also check the crankarms, for manufacturer and possible date code. My bike has "Centurion" engraved, or rather punched, at the handle bar stem (Pics will follow as soon as I figure out how put them in my reply), wich I canīt recall I have seen that often.

As you know for sure, Centurionīs are still aviable in Scandinavia, i presume with Denmark as home base (but of course Asian made). Along with Nishiki they seem to have a good reputation for their hybrid and sport bikes, unfortually mostly alloy frames.