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2. Penny (United States coin) - Wikipedia

   en.wikipedia.org/wiki/Penny_(United_States_coin)

   The penny, also known as the cent, is a coin in the United States representing one-hundredth of a dollar.It has been the lowest face-value physical unit of U.S. currency since the abolition of the half-cent in 1857 (the abstract mill, which has never been minted, equal to a tenth of a cent, continues to see limited use in the fields of taxation and finance).

3. Coin grading - Wikipedia

   en.wikipedia.org/wiki/Coin_grading

   The quality of all coins is not equal and collectors felt the necessity of defining the quality of the coins in order to assess their value. Rim damage, nicks, polishing, cleaning, scratches and other forms of wear are considered factors in grading a coin. Whether or not a coin shows evidence of having been mounted in jewelry also affects its ...

4. Coins of the United States dollar - Wikipedia

   en.wikipedia.org/wiki/Coins_of_the_United_States...

   Unmarked coins are issued by the Philadelphia mint. Among marked coins, Philadelphia coins bear a letter P. Denver coins bear a letter D, San Francisco coins bear a letter S, and West Point coins bear a letter W. S and W coins are rarely found in general circulation, although S coins bearing dates prior to the mid-1970s are in circulation.

5. Half cent (United States coin) - Wikipedia

   en.wikipedia.org/wiki/Half_cent_(United_States_coin)

   The half-cent piece was made of 100% copper and half of a cent, or one two-hundredth of a dollar (five milles). It was slightly smaller than a modern U.S. quarter with diameters 22 mm (1793), [1] 23.5 mm (1794–1836), [2] and 23 mm (1840–1857). [3] They were all produced at the Philadelphia Mint.

6. Large cent - Wikipedia

   en.wikipedia.org/wiki/Large_cent

   The United States large cent was a coin with a face value of 1/100 of a United States dollar. Its nominal diameter was 1 1 ⁄ 8 inch (28.57 mm). The first official mintage of the large cent was in 1793, and its production continued until 1857, when it was officially replaced by the modern-size one-cent coin (commonly called the penny ).

7. Precious metal - Wikipedia

   en.wikipedia.org/wiki/Precious_metal

   In 2012, the Perth Mint produced a 1-tonne coin of 99.99% pure gold with a face value of $1 million AUD, making it the largest minted coin in the world with a gold value of around $50 million AUD. [2] China has produced coins in very limited quantities (less than 20 pieces minted) that exceed 8 kilograms (260 ozt) of gold.