Mark...
Love that Brooks' Kelloggs Proof Card (never seen any, let alone Brooks!)...
There was a tough oddball/test issue from Topps back in 1997 called "ProShooters Marbles." There were 60 plastic marbles in the set (the checklists are collectible as well) and the rumor was that they were distributed in Canada.
Here is the Cal Ripken Jr. marble and checklist (with him pictured):
