Wow, SR Apex with the goofy BCD (I have two of those myself), Superbe Tech rear derailleur, and ... whew! For a second there, I thought that was a Helicomatic rear hub, which would have fit right in beautifully with the other evolutionary dead ends. You have the really wide section rims, too, kind of a nice time capsule. My ST500 was an '86 (I think) and by that time Cannondale had gotten into the habit of cleaning up the welds a bit more, so yours is for sure a real forerunner. Very nice survivor.
Now adjust those bars! My wrists are getting sore just looking at them.
