In the collection of coins, key dates refer to the date (or combination of date and mint sign) of a series of coins or specific sets that are more difficult to obtain than any other date in the series. The next level that is difficult to get coins in series is often referred to as semi-key or simply semi-key date.
For example, VDB 1909-S is the key date in the Lincoln cent series. 1914-D and 1931-S are considered semi-keys. In the UK, coins worth  £ 1 from 1988 are considered as key date coins.
What makes the "key" coins somewhat more complicated is because there are many problems that are easily acquired in the lower classes and are very difficult to find in the higher ones. Collectors who want a circuit in unbundled state may find some very rare date/mint combinations. This is because low mosaic coins are often stored by collectors and see little or no circulation, while common dates are rarely stored and usually get very outdated. Another factor in making unconditional is is that in certain years some or all of the candies perform a bad coin strike. For example, finding the usual 1919-D Walking Liberty half dollar in perfect non-circulation perfect conditions is an almost impossible challenge even for the collector of substantial means.
Professional and avid coin collectors often collect not only coins, but will specialize on certain types of coins and then try to collect each coin in series, ie one of each year type of coins printed with all variations. This variation usually includes a mint mark, but other variations can exist. One possibility could be the material in which the coin was printed. In a few years, for example, the same coin may be printed from two or even three different metal combinations, such as steel, nickel, iron, gold, bronze, or silver. The Eisenhower dollar, for example, is printed in a cupronickel for a circulation strike but on 40% silver for unassailed collector evidence and specimens from 1971 to 1976. Artistic differences or errors on die over coins and at the highest quality that can be found. also may varieties of collectors may pursue. The 1922 "no D" and "weak D" Lincoln cents are examples where very outdated dies hit a coin with a missing or very dim mint mark. The 1942/1 Mercury printed in 1942 is another example, where a hubbing error produces a coin in which the last digit of the date indicates "2" is superimposed on top of "1".
Experienced collectors can start collecting by first obtaining specimens from key dates, since the "key date" coin for a set often prevents the collection from being a complete set. After the key date, which often represents the main part of the collection value, getting the set set is a pretty simple issue.
Video Key date
Partial List of US Coin Lock Date
- 1793 Chain Chains
- 1799 Draped Bust Cent
- 1804 Draped Bust Cent
- 1823 Capped Bust Cent
- 1856 Flying Eagle Cent
- 1877 Indian Head Cent
- Head of India Center 1909-S
- 1909-S VDB Lincoln Cent
- 1909-S Lincoln Cent
- 1914-D Lincoln Cent
- 1922 Plain Lincoln Cent
- 1931-S Lincoln Cent
- 1955/55 Doubled Die Lincoln Cent
- 1972/72 Doubled Die Lincoln Cent
- 1885 Liberty Nickel
- 1886 Liberty Nickel
- 1912-S Liberty Nickel
- 1913 Liberty Nickel
- 1913-S Type II Buffalo Nickel
- 1916/16 Duplicate Die Buffalo Nickel
- 1926-S Buffalo Nickel
- 1937-D "Buffalo Nickel" Three Legs
- 1950-D Jefferson Nickel
- 1873-CC No Liberty Dime Sitting Arrows
- 1894-S Barber Dime (Evidence Only)
- 1916-D Mercury Dime
- 1921-D Mercury Dime
- 1896-S Barber Quarter
- 1901-S Barber Quarter
- 1913-S Barber Quarter
- 1916 Standing Liberty Quarter
- 1932-D Washington Quarter
- 1932-S Washington Quarter
- 1878-S Seated Liberty Half Dollar
- 1892-O "Micro O" Half Dollar Barber
- 1916-S Walking Liberty Half Dollar
- 1921-D Walking Liberty Half Dollar
- 1938-D Walking Liberty Half Dollar
- 1804 Dollar Bust
- 1870-S Seated Liberty Dollar
- 1879-CC Morgan Dollar
- 1884-S Morgan Dollar
- 1889-CC Morgan Dollar
- 1892-S Morgan Dollar
- 1893-CC Morgan Dollar
- 1893-S Morgan Dollar
- 1894 Morgan Dollars
- 1895 Morgan Dollars (only known in the evidence)
- 1895-O Morgan Dollar
- 1895-S Morgan Dollar
- 1901 Morgan Dollars
- 1921 Peace Dollar
- 1928 Peace Dollar
- 1934-S Dollar Damian
Maps Key date
Reference
Source of the article : Wikipedia
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