Joined: Sep 2005
Posts: 2,994
Likes: 300
From: Hervey Bay, Qld, Australia.
Bikes: Colnago (82, 85, 89, 90, 91, 96, 03), 85 Cinelli, 90 Rossin, 83 Alan, 82 Bianchi, 78 Fountain, 2 x Pinarello, Malvern Star (37), Hillman (70's), 80's Beretto Lo-Pro Track, 80's Kenevans Lo-Pro, Columbus Max (95), DeGrandi (80's) Track.
Hi bbjac,
The new photo's reveal Columbus tubing - SL infact. There are serial numbers stamped either side of the seat cluster and they appear to be replicated on the bottom bracket (although I cannot quite see the numbers clearly). If it were an Italian built frame there would probably be a decal stating that it was made in Italy. Also, if it were made in Italy the 4.O on the LHS of the seat cluster (during the Piaggio era) would suggest that it was made in 1984. The "O" might not be a zero - it may be a letter "O" indicating a mid year build.
I know little about Japanese built Bianchi's and even less about their serial numbers - sorry.
I think the key to the place of manufacture remains the bottom bracket. I'm sticking to my guns and suggest that a 68mm wide bottom bracket with a 1.375" x 24tpi thread (British) is an indication that the bike is Japanese built.
Best of luck with your search,
Gary.