The 1-1/2 inch plastic coins, almost the same each year, came in many colors with several rare and perhaps even 1-of-1, making a "master" set almost impossible. Add in the variations and you can imagine the task.

See sportscollectorsdaily for great 1955,1959 & 1960 Armour baseball coins article.

Topps first Candy Lids in 1970 and they are very, very hard to find. They had small photos of Tom Seaver, Carl Yastrzemski & Frank Howard.

1970 Topps Candy Lids were called "Baseball Stars Bubble Gum", had 24 players, the 1973 Topps Candy Lids had 55.

Topps planned 1972 Candy Lids but never released it, a few proofs do exist.

Topps 1973 Pinups & Comics share many of the same photos.