If you pick Winfield, you get his 70's card for your 70's team AND his 80's card for your 80's team. However...each one of those cards has 5 seasons on it (70's card has '75, '77, '78, '79, and '80) (80's card has '79, '80, '82, '84, '88).
It is a mystery of which season you get for each team...