Sorry, should've added another link above. Thanks, Doug.
http://www.error-ref.com/rim-cud/Adding the obverse and reverse dies contain and create the raised design rim seen when the coin is viewed straight on.
An undamaged collar die when setup proper stops or restrains outward metal flow and aids the creation of the coins edge and maintains diameter. Also the rim and other devices benefit by what I'll describe as a backfill effect. Thanks, Doug.
Edited by Halo1st
05/04/2018 11:52 am