Thanks Cudak888 & USAZorro.
I did look through the Campagnolo timeline of products at <www.velo-retro.com/tline> and find the introduction of the following rear derailleurs:
1946 Corsa & Super
1949 Gran Sport
1951 Cambio Corsa, Tipo Paris-Roubaix, Gran Sport
1952 Gran Sport Extra, Sport
1961 Sportman
1963 Record
1964 Valentino
1967 Valentino Super, Nuovo Sport, Nuovo Record
1968 Valentino Extra, Sport Extra
1970 Gran Turismo
1971 Velox
1973 (End of Record)
1974 Rally, Super Record, Nuovo Gran Sport
1982 Gran Sport Rally
1985 C(Corsa)-Record
1987 (End of Super Record)
Some are labeled as "low cost" but otherwise no indication of performance ranking. I didn't see Athena listed.