One of the rarer and more interesting variations that can be found in 1987 Topps, are the Turn Back the Clock subset cards showing a yellow, rather than white, date in the bottom right corner. Only a handful of these have shown up over the years and are only cataloged (or even mentioned) in the 1990-1991 Dick Gilkeson Error & Variation guides. Although all 5 subjects are listed as having this variation, I can only account for Reggie Jackson (5 times over), Roberto Clemente (1 copy), and Rickey Henderson (1 copy), meaning that I have yet to a Carl Yazstrzemski or Maury Wills at this point.
I find these especially interesting since they harken back to the 1957 and 1969 Topps yellow/white variations. Considering how many 1987 Topps cards were produced, these yellow date varieties a true needle-in-a-haystack find.
Junk Wax Gems 
I have 1 copy of Reggie Jackson-1977 2 copies of Rickey Henderson-1982 and 3 copies of Roberto Clemente-1972. All these cards are Turn Back The Clock.
I have a Jackson and a Henderson. Wonder if any others besides those and Clemente exist?
I have Yaz/Wills with partial yellow, but not as blatant as the Jackson example above. Seems like a shift of the yellow plate, since they’re in the same shape as the outline of the ‘white’ number.
That is because these are not real error cards. They just have a yellow ink print offset.
Ive found four variations on Maury Wills including a yellow date but its a yellow over run . It looks very similar next to the Henderson yellow date .