Mint experimented with different materials—including glass! Ultimately, the Treasury Department settled on copper-plated zinc for the Lincoln penny beginning in One of the experimental compositions that was rejected was an aluminum alloy. The pieces were shown to members of Congress and subsequently destroyed. By some misadventure, at least a dozen pennies made of aluminum escaped from the Philadelphia Mint despite the D mintmark in Thus far there are only two known to exist.
Astonishingly, the mint took the curious step of seizing one of the aluminum cents , deeming the coin to be government property. If another example is found and deemed legal to own , it would easily realize six figures at auction. Another die error resulted in this case of a missing limb: the 3-legged buffalo.
It is among the most famous error coins ever to exist, and undoubtedly the "key date" to the entire Buffalo nickel series. Despite early popularity when the design debuted in , the Buffalo nickel also called the Indian Head nickel was plagued by dies that quickly exhausted. The result was many weakly struck coins. In , the second-to-last year of the series, the mint employee who operated the coin presses at the Denver Mint tried to smooth down some scuffs on the nickel's reverse die.
He unintentionally smoothed away one of the buffalo's legs in the process. Another popular error variety to collect are overdate coins. This die error is pretty straightforward: When changing the year-date on the obverse die, the last digit of the previous year was not fully removed.
In the case of the "42 Over 41" Mercury dime, this resulted in the "1" still being visible behind the "2" of the date. Interestingly enough, this same overdate error appears on Mercury dimes from both the Philadelphia and Denver Mints. As a general rule, you don't normally see proof coins with errors.
Proofs are specially made for collectors. Extra care is taken in their production, minimizing the chances of an error eluding the attention of mint workers. Nonetheless, the U. Mint somehow included a few dimes in their proof sets that lacked an S mintmark from the San Francisco Mint. To date, two such examples of a Roosevelt dime proof with a missing mintmark have been identified.
As far as anyone knows, these incredibly rare dimes could only be obtained from the annual mint proof sets. It's no surprise this coin is so valuable given its current population is just two. Image: CoinWeek. A similar mistake occurred with the circulation-strike Roosevelt dimes that came from the Philadelphia Mint in The mint had only recently added the P mintmark to its cent coins, beginning in Previously, coins from the Philadelphia facility bore no mintmark. Somebody forgot to punch the "P" onto the obverse dies for the dime in The process was still done by hand at the time.
Several thousand of these "No P" Roosevelt dimes were distributed before the mistake was caught. Compared to some of the earlier coins on this list, that might sound like a lot. Yet it's a minuscule fraction of the entire P dime mintage of nearly million coins. We believe that coin collecting should be accessible to anyone who has a desire and an interest in the hobby.
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