Rarity Factor
Further information: Coin grading#Rarity factorThe value of coins depends on their rarity. There are several scales which have been developed for the definition of the rarity of a particular coin. The most common are the "Sheldon rarity scale" and the "Universal rarity scale" "Rarity Scales". http://www.medjh.com/coins/halfcentsrarity.htm. "Rarity System". http://varietynickels.com/pages/other-numismatic-information/rarity-system.php. Retrieved June 3, 2010.
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