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<p>[QUOTE=&quot;Cherd, post: 1408279, member: 24754&quot;]It&#039;s a difficult question to answer because there is no formal definition of &quot;key date&quot;. Determine the factors that are most important to you (mintage, general value, population reports, variations, etc) and generate your own list. In my opinion, the values listed in price guides are the best delineator. These values reflect the collaborative effort of the entire coin collecting community in determining which coins are more or less difficult to find in various conditions. My method for determining key dates would be to obtain a list of values for all of the coins in a series at the grade that I am interested in, remove errors and other variations (these aren&#039;t particularly important to me), rank the coins from most to least expensive, and then select a cutoff point.[/QUOTE]</p><p><br /></p>

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