Undertype. An identifiable coin or medal that has been overstruck, the object has been used as a planchet and struck again with a second design. The undertype design is mashed but the design may still be discernible as lines where relief or lettering once existed. See overstike, overstruck.
excerpted with permission from
For Artists, Makers, Collectors and Curators
COMPILED AND WRITTEN BY D. WAYNE JOHNSON
Roger W. Burdette, Editor