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Caad3 vs Cad3 = caad3, logo design issue, cf snapshot from 97 catalogue ;). I think frames stickered "cad3" are older.
These are also different than old cad 3.0 series frame, the one before 2.8 series frame, with funny dropouts :)
For Rsomething vs Rsomethingelse, except than the bigger the better, it's difficult to tell without proper catalogue for year and country, too much variations..
What is the difference between R500
and R1000