My collection are all production bikes from the 70's, one from each of the major producing countries of that time (I think of Japan as coming on in the 80's). They are all top of the line racing bikes and non-intentionally all made with Reynolds 531.

Italy - Masi GC (Carlsbad made but close enough for me)
France - Motobecane Champion Team
England - Raleigh Professional
United States - Schwinn Paramount P-13

May not be logical to anyone else but it makes sense to me!