The best candidate would appear to be a 1984 Miele Elite, though I have no literature for that year. While I cannot provide a definitve statement, the serial number is a standard format and suggests a 1984 model (and likely either from weeks 9-10 or May), while the cables routed over the bottom bracket also indicate pre-1986. Some of the components also suggest 1984, but their level is not typical for a Columbus SL frame and their are probably non-original. Furthermore, the dropouts suggest it was likely originally SunTour equipped and slightly later, mid-1980s versions of the Elite were indeed SunTour equipped.