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2. US error coins - Wikipedia

   en.wikipedia.org/wiki/US_error_coins

   A die clash occurs when a planchet is not fed into the collar that holds the coin in place for the minting process. The two dies meet and each carries away part of the design embedded on the die. Coins minted using these dies cause coins to be minted with parts of the reverse design on the obverse or parts of the obverse on the reverse of the coin.

3. American Arts Commemorative Series medallions - Wikipedia

   en.wikipedia.org/wiki/American_Arts...

   Donald Regan, Secretary of the Treasury and chairman of the commission, later told reporters that a gold coin could be easier to sell than medallions, because the suggested coins "could be redeemable in dollars". [18] The Mint issued gold coins for the 1984 Summer Olympics in Los Angeles and for the centennial of the Statue of Liberty in 1986 ...

4. Glossary of numismatics - Wikipedia

   en.wikipedia.org/wiki/Glossary_of_numismatics

   The combination of a particular obverse and reverse set of dies. If one die is replaced, a new die marriage is created. die state A variation in the appearance of a coin struck by a single die, resulting from wear or alteration of the die. For example, the presence or absence of die cracks may signal a specific die state. die variety

5. List of United States commemorative coins and medals (2000s)

   en.wikipedia.org/wiki/List_of_United_States...

   Schoolhouse, teacher and students planting a tree; based on the Grant Wood painting Arbor Day [1] [2] Captions: "Foundation in Education", "Grant Wood" Circulation: 213,800,000 P 251,400,000 D Proof: 2,740,684 S (clad) 1,769,786 S (silver) 25¢ Wisconsin quarter George Washington Head of a cow, round of cheese and ear of corn (state grain).

6. Coinage metals - Wikipedia

   en.wikipedia.org/wiki/Coinage_metals

   Many coins throughout history were made of gold, silver and copper. Silver: Gold: Iron: Numerous Chinese cash coins were made of iron, with the first being issued by the Han dynasty in 118 BCE. From 1942 through 1952, some of the Swedish krona coins – such as the 1, 2 and 5 öre – were made of iron. Lead: Most commonly seen in southeast ...

7. Denver Mint - Wikipedia

   en.wikipedia.org/wiki/Denver_Mint

   The Denver Mint is a branch of the United States Mint that struck its first coins on February 1, 1906. [2] The mint is still operating and producing coins for circulation, as well as mint sets and commemorative coins. Coins produced at the Denver Mint bear a D mint mark (as did the Dahlonega Mint, which closed before the Denver branch opened ...