Reasons Why a Repeat Coin Appraisal May Change the Grade of the Coin
There are 70 grades that may be assigned to coins and these determine the quality and worth of the particular coin. Grades assigned to a particular coin need not be considered the final assessment about that coin. Two reasons may be attributed as to why a coins grade can change to give it a higher grading or for a coin to be degraded; one being its changing conditions and the other, an earlier inappropriate coin appraisal.
Unless a coin is sealed and well protected in the right type of holder, the coin may be subject to changes due to environment conditions or due to proximity with other coins during storage; and the resulting changes in color or texture of the coin may alter the grade of the coin. Such coins will require a new coin appraisal to determine its grade in keeping with the new conditions of the coin. This most probably results in degradation of the coin.
However for a coin that has been well-preserved, chances of receiving higher grades is possible due to scarcity over a period of time, as collectors buy them up over the years, making them a rarity. Hence a coin appraisal done after a few years may give the coin a higher grading.
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