brockage

Definitions

from The Century Dictionary and Cyclopedia

noun In numismatics, an imperfect coin.
noun Broken or damaged material; broken glass, pottery, etc.

Examples

A historic and unique remnant of the ancient Roman minting process, and perhaps the first known evidence of early coin brockage.

Unique Ancient Coin Die Tiberius, 14-37 A.D. : Coin Collecting News

Note

The word 'brockage' may be related to 'broken'.