| All rights reserved. |
Rare Coin House.com
J
Jefferson Nickel
The Felix Schlag designed five-cent coin first struck from 1938 to date.
K
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. Most sets have more than one key coin. In Lincoln cents, for instance, the
1909-S V.D.B., the 1914-D, the 1922 Plain and 1955/55 Doubled Die are all considered to
be key coins in most grades. In MS65RD the 1926-S is the rarest of the regular issues, so it
is considered the "condition rarity key." At times any scarce or rare coin is referred to a
"key" coin. The terms "key to the set" or "key to the series" are also used as synonyms for
"key coin."
Jefferson Nickel
The Felix Schlag designed five-cent coin first struck from 1938 to date.
K
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. Most sets have more than one key coin. In Lincoln cents, for instance, the
1909-S V.D.B., the 1914-D, the 1922 Plain and 1955/55 Doubled Die are all considered to
be key coins in most grades. In MS65RD the 1926-S is the rarest of the regular issues, so it
is considered the "condition rarity key." At times any scarce or rare coin is referred to a
"key" coin. The terms "key to the set" or "key to the series" are also used as synonyms for
"key coin."
1-877-261-6869