[brewing]

Just about every hall of famer had a photo used twice on their base card, especially when you add 54-56. Here are some from the 60's that I found.
Banks 68 & 69
Drysdale 61 & 62
Gibson 61 & 63
Kaline 61 AS & 62
Killebrew 58 & 59
Marichal 62 & 63 small photo, again in 67 & 68
Mathews 62 & 63 small photo
Mays 65 & 68
Mazeroski 60 small photo & 61
McCovey 61 & 63, 60 & 63 small photo
Morgan 68 & 69
Musial 60 small photo, 62, & 63 small photo
BRobinson 63 & 64
FRobinson 63 small photo & 64
Santo 62 & 63 small photo
Spahn 60 & 63 small photo's
Stargell 63 & 64?
Wilhelm 60 & 63 small photo's
BWilliams 63 small photo & 64
Yaz 60 & 61, again 63 & 64

As was mentioned the repeat photos and the late 60's cap less photos were because of the great Marvin Miller.
No real excuse for the pre 1968 duplicates though.