A friend of mine passed a frame to me that was supposedly a 'vintage' Bianchi flat bar road bike. It came to me with the worst rattle can paint job I have ever seen with surface rust in several spots where paint was missing. Feeling inside the tubes at the bottom bracket I found that there is at least some surface rust inside the tubes. The bike is steel, the bottom bracket has a seam, the stay brace and break bridge are plain tubes and the lugs and dropouts are 'generic'. The chain stays are crimped from and after market kickstand. The fork is a threaded steel uni-crown.

It came with a VeloOrange threaded headset and a worn out loose bearing, square taper bottom bracket. The bottom bracket is English threads.

The underside of the lugs have a blocked swirl kind of symbol with different numbers at the head tube. The underside of the top tube lug has a G2, the underside of the downtube is a FO. The underside of the top tube lug at the seat cluster has the same symbol with a G3. The bottom bracket has two numbers. The forward side number is h9B37350 and the rear side number is 5o64.

It is possible I am wrong but I don't see a vintage bike, I don't know enough about Bianchi's to be certain but I don't think it is since it has English threads.