I wondered that myself. According to NCS coins "This gradual erosion of a die's surfaces imparts a grainy texture which reflects light in multiple directions. This may be seen by turning an uncleaned coin under a lamp, noting that its luster swirls and remains more or less constant in all directions (the "cartwheel" effect). When a coin is cleaned with either harsh chemicals or abrasives, this texture is smoothed out, and the coin's surfaces lose the peaks and valleys which are typified in its swirling luster."...so maybe this is indicative that the coin hasn't been cleaned.
It could also be crystallization...caused by long term metallurgical changes. Although the latter is typical of silver coins.
It could also be crystallization...caused by long term metallurgical changes. Although the latter is typical of silver coins.
Edited by CopperCastle
08/21/2014 12:54 pm
08/21/2014 12:54 pm






















