Marking
Marking. A British term for upsetting; also called rimming in Britain. The Jones Marking Machine was invented by London mintworker Meredith Jones in 1860 to prepare planchets that are deburred with a thickened edge for high speed coining.
excerpted with permission from
An Encyclopedia of Coin and Medal Technology
For Artists, Makers, Collectors and Curators
COMPILED AND WRITTEN BY D. WAYNE JOHNSON
Roger W. Burdette, Editor