C10- Mint, Unused.
C9 - Near Mint, if used, it was with great care.
C8 - Very nice, some wear visible.
C7 - Presentable, has lost tightness, minor scratches or damage.
C6 - Play wear, with staining or damage.
C5 - Heavy wear and spots, often damaged/repairs.
C4 - Many faults, heavy scratching, damaged, spots.
C3 - Quite damaged, useful if covered up.
C2 - Has had very hard play.
C1 - Useful only for parts.