Definitions for "Die variety"
Keywords:  mintmark, obverse, slight, struck, coin
A coin with a slight variation from the normal design attributed to a particular issue. These small differences result when minor design variations are made to obverse and/or reverse dies as they are replaced when they wear out.
Because dies wear out often different pairs are used to strike coins and a coin of one type can be circulated with a slight die variety. The variety can be a very minor difference that you would never notice if you didn't know it existed! Some collectors are keen to collect all the known die varieties of certain coin types.
a unique combination of obverse and reverse dies