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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..
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What is the difference between R500
and R1000