Re:
I'd plump for 1989-90, as that was the model I once wanted as a teenager and remember it well. Later Record Sprints used smaller, more restrained decals with less bling (and Shimano Tourney SIS or Sachs Classic index derailleurs with plastic levers rather than the Light Action model shown). Older ones had even more gold anodised bits (including Weinmann calipers and non-aero levers), with the earliest versions having ovalised frame tubes (as per the Raleigh Quasar), and no index gearing; friction gears came in the shape of a Sachs Rival rear mech anodised with yet more - you guessed it - gold!*
David
*Sorry, I momentarily came over all Spandau Ballet there.