Cut-off

A numismatic issue that is readily available. Since this is a relative term, no firm number can be used as a cut-off point between common and scarce.
common date ...

Since this is a relative term, no firm number can be used as a cut-off point between common and scarce. common date A particular issue within a series that is readily available.

See also: Surfaces, Reeding, Liberty, Alloy, Edge device