A funny thing about the English Raleighs is that the high-end bikes
had unique lugs & fork crown, and the low-end bikes changed lugs &
crowns & dropouts & brazing almost every year, and so its actually
possible to identify a "nude 1970's raleigh" with no paint, down to
the year, in most cases ...

Here are the ingredients used to identify an old Raleigh 10-speed :

Serial Number: Bottom Bracket(high end), Rear Dropout(low end)
Dropouts : Huret/Zeus(Competition), Campy(Pro/Int), Simplex(RRA), Stamped
Seatpost Size : 26.8, 27.0(531 butted), 27.2(531 double butted), 27.4(753)
Lugs : Bocama, Nervex, Prugnat-Long, Prugnat-Competition, Capella
Brazing : Seat Tube over-the-top(1972, earlier), Normal(1973-onwards)
Rear Brake Stop : single(1974 or before), double(1975-onwards)
Top-tube Cable Stops : Absent(Competition, Pro, Team), Present(Low-end)
Fork Crown : Vagner(3 types), Zeus(Pro)
Bottom Bracket : Generic, Nervex, Bocama
Bottom Bracket Braze-ons : None(International, Professional, RRA), present
Downtube Shifter Braze-ons : Competition, Professional, Team
Chain peg : Team
Rear Centerpull Stop : Present(not RRA/Competition(1976)/Pro), Absent(lowend)
Chrome : Front Forks, Rear Forks, Fork Crown(Pro/SuperCourse), Lugs(Internat'nl)

- Don Gillies
San Diego, CA