A Grade: The best of the batch. DOES NOT MEAN FLAWLESS. Enamel pins are handmade and thus, almost all pins have something that could be considered a flaw. A grade means the ones with least amount of noticeable flaws.
B Grade: Minimal, but noticeable flaw such as, but not limited to, a shallow scratch on enamel (not on the face), small part of missing enamel or screenprint. These are just examples.
C Grade: Large and noticeable flaw such as, but not limited to, wrong colored enamel, a deep scratch, a flaw on the face, missing enamel or screenprint. These are just examples.
Clearance Pins: These pins are sold as STANDARD. Meaning you could get anything from an A grade to a C grade. C grades are not very common so it is unlikely C grades are in the batch, but it is possible. The pricing of clearance pins reflects this. There is absolutely no exchanges or refunds on a clearance pin.