I've been trying to research the Diamondback frame I just bought and there doesn't seem to be a lot of info available. I "think" it's a 1990 but of all the pictures I have found on the internet of Diamondback Centurion Interval bikes mine is the only black one I have found. Every other one listed as a 1990 was white with blue on the front and rear of the frame. The data on Sheldon Brown's site stops at 1989 so it was no help. It appears the black is somewhat uncommon which would be kind of cool. I'm not planning to do a restoration on it but I'd like to know the history behind it. Here's how I bought it:



......and this is how the guy I got it from bought it:



Here's what the paint on every other one I've found that was identified as a 1990 looks like:



From what I can see the '91-'92 Intervals had "TG" behind the "Interval" and came in different colors, I believe these were TIG welded frames. Mine is a brazed lugged frame with Tange #2 tubing.