iut is certainly a Japanese frame but I am not sure of the model. Bianchi does not seem to specify which tubing is used unless it is a Columbus frame, and most of the limited in the catalog seem to have what looks like Ishawata decals
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“One morning you wake up, the girl is gone, the bikes are gone, all that's left behind is a pair of old tires and a tube of tubular glue, all squeezed out"
Sugar "Kane" Kowalczyk