I believe that may be an early X4. According to the following site, the early X4's had the normal, square brake bridge like yours. Excellent save! Now you need to find a fork.
The Bianchi X4 Code — Velo Aficionado
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My collection: 1947 Ciclo Piave, 1955 Liberia, 1969 Colnago Super, 1972 Legnano Olimpiade Record Specialissima, 1980 Mercian Vincitore, 1983 Gitane Interclub, 1985 Peugeot PGN10, 1985 Eddy Merckx Corsa, 1985 Hood Cycles Lo-pro, 1986 Bianchi Vittoria, 1987 De Rosa Professional, 1989 Vitus 979, 1989 Bianchi Super Leggera, 1990 Bianchi Axis, 1990 Specialized Sirrus, 2001 Colnago Dream B-Stay, 2007 Trek 1000
Last edited by Brad L; 09-11-25 at 07:46 PM.