I had two bikes that were VERY close in serial number. Orange 23"-frame 1974 Fuji Special Tourers, both bought new by me... First was F9B18529, which was stolen from my high school bike rack at just three months old. I replaced it with F9B18546 - same make/model/size/color. That later one was kept for two years, and sold to my friend's sister to finance my '75 S-10S, bought new in Oct '76.