The New Orleans Mint (O mint mark) closed at the beginning of the Civil War (1861) and did not re-open until the end of Reconstruction in 1879. During its two stints as a minting facility, it produced both gold and silver coinage in eleven different denominations, though only ten denominations were ever minted there at one time (in 1851 silver three-cent pieces, half dimes, dimes, quarters, half dollars, and gold dollars, Quarter Eagles, half eagles, eagles, and double eagles).---Wikipedia
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