Sounds like early 80s to me. The Ax components were introduced late '79 and the frames were labelled Araya and Delta(?) and other proprietary names, but basically a pretty blue green color made of Tange tubing; also Lotus and Miyata had their own versions although only with oval tubes through the seat collar requiring oval posts. The components are beautifully designed ( many of us watched Lance use an AX brake on his time trial bike and AX dt shifters) but the frames are somewhat squirrely in the bottom bracket. The later Columbus tubing versions used a second inner shell to control the bottom bracket flex and that helped alot. Some high end frames used the oval seattube spreading to a round seatpost (Condor). I think it was one of the great design breakthroughs of Shimanos most inventive period( 10 pitch/ Deore mountain bike components/DD pedals) and it is still being explored in derivative ways today(aero wheels, flattened tubes, SIS derived from the click shift AX rear derailleur) IMHO...Alan Bernstein