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2. Coin grading - Wikipedia

   en.wikipedia.org/wiki/Coin_grading

   Coin grading [1] is the process of determining the grade or condition of a coin, one of the key factors in determining its collectible value. A coin's grade is generally determined by six criteria: strike, preservation, luster, color, attractiveness, and occasionally the country/state in which it was minted. Several grading systems have been ...

3. Sheldon coin grading scale - Wikipedia

   en.wikipedia.org/wiki/Sheldon_coin_grading_scale

   Coin dealers will normally grade these coins at or below the ones shown for that respective type, the grades here depend on how bad the issue or issues are. [27] Grading services typically label these coins as "authentic" with x grade "details" (ex: "EF details"). Coins that are uncirculated as mentioned above can not go below an MS-60 grade.

4. United States Mint coin sizes - Wikipedia

   en.wikipedia.org/wiki/United_States_Mint_coin_sizes

   This chart shows all of the coin types, and their sizes, grouped by coins of similar size and by general composition. [1] Seven distinct types of coin composition have been used over the past 200 years: three base coin alloys, two silver alloys, gold, and in recent years, platinum and palladium.

5. Gold coin - Wikipedia

   en.wikipedia.org/wiki/Gold_coin

   Gold coins for sale at the Dubai Gold Souk. A gold coin is a coin that is made mostly or entirely of gold.Most gold coins minted since 1800 are 90–92% gold (22‑karat), while most of today's gold bullion coins are pure gold, such as the Britannia, Canadian Maple Leaf, and American Buffalo.

6. American Gold Eagle - Wikipedia

   en.wikipedia.org/wiki/American_Gold_Eagle

   The 22 kt gold alloy is an English standard traditionally referred to as "crown gold". Crown gold alloys had not been used in U.S. coins since 1834, with the gold content having dropped since 1837 to a standard of 0.900 fine for U.S. gold coins. For American Gold Eagles the gold fraction was increased again to .9167 or (22 karat).

7. Standard Catalog of World Coins - Wikipedia

   en.wikipedia.org/.../Standard_Catalog_of_World_Coins

   Standard Catalog of World Gold Coins: With Platinum and Palladium Issues: 1601–present, 6th Edition, publication date 2009, Krause Publications, ISBN 978-1-4402-0424-1 Digital copy available separately. Unusual World Coins, 6th Edition, publication date 2011, Krause Publications, ISBN 978-1-4402-1702-9 Digital copy available separately.