Pin Grades
A Grade or Standard enamel pins have no visible flaws OR flaws which are very minute and not immediately noticeable. (Currently I do not sell S Graded pins {perfect no flaws} separately!)
B-Grade pins have minor-moderate flaws like slight scratches, small areas of underfilled or over filled enamel and so on. These pins are still a very nice quality but are available at a lower price!
C-Grade pins have major flaws like dust or noticeable screen printing issues. These pins can look ok at a glance, but are sold at a very cheap price.