While the rear derailleur is New Cyclone, which was released for the 1985 model year, my 1985 Nashbar literature shows the 1985 model still being the MK II. The MK III came out in 1986. Still, it could have been manufactured in late 1985. Most of the mid-1980s Nashbar bicycles were manufactured by Maruishi and, if so, the serial number will tell us the exact frame manufacture date. The tubeset is an unspecified Ishiwata CrMo double butted. The seat post diameter will confirm the grade but I suspect 022. FYI, the original MSRP was $374 US + $30.00 express shipping. Don't you wish you could still express ship a bicycle for that price?