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Message:: [QUOTE="yakpoo, post: 1243271, member: 18157"]Key dates are generally the coins within a series that has the lowest mintage or surviving population. For instance, the 1916-d Mercury dime is considered the "Key" date of that series. Just as the 1877 Indian Head Cent (IHC) is considered the "Key" for that series, etc. The only coins that are sold exclusively in the modern (1992-Present) Silver Proof set is the Kennedy Half and the Roosevelt Dime; all of the other coins are available in other sets. That means that these are the only two coins whose mintage is restricted to the number of Silver Proof sets sold. Between 1992 and now, the lowest sales of Silver Proof sets was the 1995 set...just under 680,000. There's a really good chance that the 2010 and 2011 sets (for the reasons given) will sell less than 600,000. That would make them the lowest mintage of the modern silver proof series.[/QUOTE]