FB in "FB Mondial" motorcycles stands for "fratelli Boselli", who started building motorbikes in Milan in 1932.
FB on hubs stands for "fratelli Brivio".
FB on a bicycles could stand for "F.B. Cicli", a small producer still in business in Pisa.
Is there an eagle/falcon design on the bike graphics (ergo fratelli Brivio)? What about a red oval (ergo fratelli Boselli)?
Aldo Ross
Middletown, Ohio