Here's my Colavito, listed by PSA as 1966-67. It's interesting as I looked it up and Colavito is numbered 15 in both 66 and 67. Also Mantle, Mays and others are similarly numbered in both 66 and 67.
But as you point out, some cards like Koufax only appear in one and not the other year and so they would be obvious as either a 66 or 67. Maybe PSA marks them 66-67 only if the player has the same number in both sets and therefore the year can't be ascertained.
Certification Number: 23588655
Reverse Cert Number/Barcode: No
Year: 1966-1967
Brand: BAZOOKA
Sport: BASEBALL CARDS
Card Number: 15
Player: ROCKY COLAVITO
Variety/Pedigree: HAND CUT
Grade MINT 9
Population: 4
Population w/Qual: 0
Population Higher:
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