$3 Gold Indian Princess Head Coins - 1856, 1878, 1874, RARE 1854, 1870-S.
The three-dollar piece was a United States coin produced from 1854 to 1889. Its value was intended to tie in with the postal system. At the time, a first class postage stamp was worth 3¢, and such stamps were often sold in sheets of one hundred stamps. Therefore, the three-dollar piece was exactly enough money to purchase a sheet of stamps. The Treasury Department also withdrew its fractional currency issues starting in the late 1870's, of which there was a 3¢ denomination. A $3 gold coin would have helped facilitate this for those desiring gold in exchange for their 3¢ coins. Despite these potential uses, the coin was minted in small quantities.
 1878 Three dollar Princess gold - $3 XF with lt scratch  US $495.00
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 1856 $3 Gold PCGS AU-50 Better Date! US $1,799.99
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 1854 $3 Gold PCGS AU-53 US $1,899.99
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 1855 $3 Gold PCGS XF-40 US $1,399.99
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 1854 $3 Gold NGC AU-53 US $1,849.99
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 1874 $3 Gold NGC AU-53 US $1,799.99
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 1878 $3 Dollar Indian Head Gold Coin US $315.00
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 1878 Princess $3.00 gold coin EX Jewelry US $500.00
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 1874 3 - DOLLAR GOLD COIN US $1,850.00
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 1856 $3 Gold Princess Type, F/VF Details US $384.00
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Authorized by the Act of February 21, 1853, the coin was designed by James B. Longacre. The obverse depicts a representation of LIBERTY wearing a headdress of an Indian princess and the reverse a wreath of corn, cotton, and tobacco. The three-dollar piece was .900 gold and .100 copper for a total weight of 5.015 grams. It had a diameter of 20.5 mm with a reeded edge. Quantities were minted in Philadelphia each year of production, as well as in Dahlonega, New Orleans, and San Francisco in certain years. Proofs were officially recorded as being minted at Philadelphia from 1859 to 1889, and only proofs were minted in 1875 and 1876. Proofs of dates prior to 1859 are also known, including extremely rare branch-mint proofs. The total quantity of coins minted each year ranges from 2 for the 1870-S (of which only one has been confirmed to collectors) to 138,618 for the 1854. Today, any specimen has a value of at least several hundred dollars, and the most valuable is the unique 1870-S, currently (2007) valued at $4,000,000 in AU-50.