Our numismatic term of the week is "Rarity". An attempt to describe how many examples of a coin still exist. When an exact number are not known then a scale of rarity is used. A scale might go from EC (Extremely Common) to S (Scarce), or from R for Rare to R5 for Extremely Rare. This `guesstimate' of the number available is usually based on knowledge rather than mint reports of the number struck.
