Split Planchet. A layer or layers of metal which peel off – due to poor alloy or annealing – either before or after the planchet is struck. Laminated alloy is susceptible to this condition if the bonding is not perfect. See lamination error.
excerpted with permission from
For Artists, Makers, Collectors and Curators
COMPILED AND WRITTEN BY D. WAYNE JOHNSON
Roger W. Burdette, Editor