Definition: A brockage is an incuse, mirror-image design generated when a coin is struck into a planchet.
NOTE: Brockages can be in-collar, out-of-collar, centered, or off-center.
They can be aligned with, or rotated relative to, the opposite, die-struck
face. The degree of expansion and distortion depends on how many previous
planchets were struck and whether one or both participants in the error were
confined by the collar.
A Lincoln memorial cent with an
in-collar, first-strike brockage of the reverse design on the obverse face. A
cent that had stuck to the obverse (hammer) die was struck into the next
planchet that was fed into the striking chamber beneath it.
