Lovely looking frame, not disagreeing with any of the above but I'd be with the guys who are saying early to mid 80s before the distinctive gilco (clover leaf profile) tubes and straight Prescia forks were introduced - perhaps a frame produced in 82/83, bought a couple of years later and the up to date at the time late generation Super Record components added?
Regardless of any of this, ride and enjoy!
Thanks for your answer. I hope that you and other "80s guys" are right - the older frame the better. Your theory of older frame and some newer components added later is interesting - and very possible.
What does the "clover leaf profile" look like? The tubes of my bike are profiled - not round.
I´ll ride and enjoy - as soon as snow has gone. And that will take about 3 long months...