Hi Sivart,
Nice bike! It looks like a newer variant of mine, which also has a tre tubi renforzati (double-butted main triangle) frame and Ofmega crankset and hubset. This would make it mid-grade, just below the Reparto Course full Columbus frames with their full Columbus tubesets. I'll be those chainrings are original; I bought a set of Bianchi-labeled Ofmega cranks on eBay, complete with black anodized chainrings.
The lead "6" in the s/n MAY indicate 1986; we're still trying to sort that out.
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"Far and away the best prize that life offers is the chance to work hard at work worth doing." --Theodore Roosevelt
Capo: 1959 Modell Campagnolo, S/N 40324; 1960 Sieger (2), S/N 42624, 42597
Carlton: 1962 Franco Suisse, S/N K7911
Peugeot: 1970 UO-8, S/N 0010468
Bianchi: 1982 Campione d'Italia, S/N 1.M9914
Schwinn: 1988 Project KOM-10, S/N F804069