One of the broad styles or modes of collecting coins, type collecting consists of acquiring and owning a series of coins, each representative of a subset, or “type” of coin. A type set of double eagles, for example, would include coins exemplifying its various designs over the years, both long-lived (such as the “Type Three” Liberty double eagle with denomination spelled out as TWENTY DOLLARS, struck from 1877 to 1907) and short-lived (the High Relief Saint-Gaudens double eagle was made only briefly in the latter year) ...
Full Article: The 1904 Double Eagle, Playing to Type - Heritage Blog
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