4 US coins that might be valued up to $3.7 million could be in your pocket.

Liberty Head nickel, 1913 The 1913 Liberty Head nickel is the most well-known rare coin. The image of Lady Liberty's head appeared on just five American nickels, two of which are in museums.

One of the most well-known and sought-after rarities in numismatics is the 1913 Liberty Head nickel, an American five cent piece that was manufactured in incredibly small amounts without permission from the US Mint, according to CoinCollectingWizard.

S. Lincoln cent, 1969 According to the coin expert, the S distinction beneath the date indicates that the 1969-S Lincoln cent was produced in San Francisco.

"The 1969-S Lincoln cent coin is extremely rare," stated CoinCollectingWizard. Before the US Mint acknowledged that the early examples were authentic, the secret service confiscated them.

1972 Lincoln cent The 1972 Lincoln cent's multiple components make it worth more than 1969-S. A lucky accident caused the coin to be slammed with a face side twice in somewhat different spots, overlapping some features.

President Lincoln's head appears normal, but the words and numbers are deformed. The 1972 Lincoln one cent coin has a double effect on the obverse, according to CoinCollectingWizard. I said $400 for this vintage coin, but condition matters.

1933 Gold Double Eagle The $20 1933 Gold Double Eagle may be the most gorgeous US currency ever.

FDR forced Americans to exchange gold coins for paper dollars during the Great Depression. The government melted 445,500 1933 double eagle coins into gold bars. Only two survived and sent to the Smithsonian.

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