Spec on the chips shown:
Interlocking "T" mold.
Blue Chip 9.25g chip
Chips were oiled 2 week earlier
Jasons labels found here
Labels adhere nicely, needed a razor blade to lift one off
No stacking issues, rubbing two chips together does not rub the label, just clay to clay
A PITA to apply for someone who drinks to much coffee, but I could "slide" the label to center before glue "cured"
Overall a very nice effect