My favorites, aesthetically speaking, for each decade:
1950s:
Perfect combo of elements: classic portrait, full action swing, fun team logo.
1960s:
Gotta go with this one too. Another perfect image of Koufax doing what he did best.
1970s:
Now, this is my childhood collecting decade, so picking the most attractive card of the era is not an easy call for me but this one has always caught my eye:
