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United States 1870-S $3 Gold Coin A great numismatic rarity was interred in the northeast cornerstone of the second San Francisco Mint on May 25, 1870, during a Masonic ceremony covered by the press. Struck especially for the event using modified dies, the 1870-S $3 gold coin joined a number of other extraordinary numismatic rarities in a copper casket in the new facility’s cornerstone, ostensibly out of collectors’ reach. The facility was completed in 1874 and would go on to serve the western region of the nation’s coinage needs until 1937. In 1907, almost four decades after the corn...

Q. David Bowers: Cycles of the US Rare Coin Market 1900 to Date Q. David Bowers for   When one thinks of boom and bust cycles, the word “investment” usually comes to mind. A broader view is to consider popularity. Various series wax and wane in demand, and different factors in the market can take precedence at different times. One of the great things about numismatics is that it seems that there is always something rising in value, even as prices and demand for other series may go down. As one considers the booms and quiet periods of the coin market from the turn of the 20th century to ...