Double Strike Error Coins
In the days when coins were struck by hand, double-strike errors could happen fairly easily. A coin-maker, not certain that he had struck a good impression, or an apprentice learning the trade would find it hard to resist striking a second time. Usually the resulting image had extra impression-lines or might contain blurred printed letters in its legend.
Especially in imperial Roman times, demands for coinage were sufficiently intense as to foster several classes of double-strike errors. The need to provide regular pay to increasingly far-flung armies meant rapid recirculation of coins collected in taxes. One quick way to produce a steady flow of coinage was to over-strike worn coins or those remaining from a previous imperial regime (occasionally, a new emperor was commemorated on the face of a coin, while the back retained symbols or even the name of his predecessor).
Modern coinage machines still display occasional double-strike errors. Collectors watch especially for double-strike errors in pennies (perhaps their low monetary value means less rigid inspection of results).
While the classic gambler's two-headed flipping coin is a true forgery, double-strikes can be detected in authentic, circulating coinage to this day.
 Error Flipover 180 Strike Missing Leafdouble Strike Cheyenne  US $1,350,000.00
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 Errors1997 Cent Double Strike Lincoln Head To Head US $38.75
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 Errors1996 Cent Double Strike Lincoln Back To Back US $52.50
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 1864 Cwt Fuld 49 343 Flip Over Double Strike Ncs R9 Very Rare Max 4 Known US $400.00
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 Error Mexico 1874 20 Ct Double Die Strike Both Sides US $155.00
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 Errors1996 Cent Double Strike US $24.50
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 Errorsflip Over 1995 Double Strike Date In 2 Nd Strike Expansion US $98.50
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 Errorsnd Double Struck Cent Extra Lg 2 Nd Strike US $37.50
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 Error Cent 1975 Double Strike US $38.50
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 1973 D Linc 1¢ Flipped Over Double Strike Ngc US $34.00
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 Scarce 1967 1 Cent Ms 64 Cameo Double Date US $160.77
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 Belgium 1905 Ten Cent Coin Error Double Strike US $79.00
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 1983 Lincoln 1¢ Nice Double Strike US $28.99
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 2001 Linc 1¢ Flipped Over Double Strike US $38.50
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 Belgium 1905 Double Strike Error 5 Cent Coin Nickel US $145.00
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