Those ADR replica frames came out in '89 and were available in at least three versions. Yours is the lowest level tubing, next up was SL with the chrome fork and chainstay, highest was SLX with internal top tube cable guides and chromed stays (although I've heard form other owners claiming to have an SL with internals and another with SLX and cable guides like mine). Mine's an SL, originally came with first year Athena in gray finish (also '89). Now has NOS 8 speed Dura Ace. All of them ride very nicely.