I only have one, Kaline, but bought it at auction. Larry Serotta ( sflyank), a member here had several at one time and I think will be able to give you more info. I believe they were an unissued test set not marketed at retail, and what few examples exist come from Topps Vault or from long time Topps employees
Dave Hornish has some info on his great blog
http://www.thetoppsarchives.com/sear...%20Dice%20Game
PSA article
https://www.psacard.com/articles/art...age-test-issue