The guys have answered it well. 1980-85 was the time for Signature models, with several top-notch builders at the helm. The later Signatures were 290, 292, and 294. I had a 1985 294 with Campagnolo Triomphe, my first real road bike that fit me. Great bike. Early Signatures and the 508 Triad are incredibly rare, but as well made as any top-shelf bicycle out there.