Numismatic Glossary - K

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Key Coin

The major, or most important, coin in a particular series. The "key" coin is usually the lowest-mintage coin and/or the most expensive coin in a particular set. The 1916-D dime, for instance, is usually considered the key coin of the Mercury dime series. It is the lowest mintage coin of the set and the most expensive (in most grades). The 1919-D dime is the "condition rarity key" of the Mercury dime series, as it is the most expensive coin in top condition.

killer

Slang term for outstanding. (i.e. That 1880-S silver dollar has killer luster.)

King

The number one coin. The 1804 dollar was referred to as the "King of Coins" in an 1885 auction catalogue. Since then, the word "King" has come to mean the most important coin of a particular series.

knife edge

Slang for wire edge.

Krugerrand

A gold bullion coin of South Africa. It is composed of .9167 fine gold. Exists in 1-ounce, half-ounce, quarter-ounce and tenth-ounce sizes.

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