Proof Coinage - United States Proof Coins

United States Proof Coins

The U.S. had largely stopped striking proof coins in 1916, although a few later specimens exist. Beginning in 1936, the U.S. Mint began producing proof coins. Proof coins through 1942 could be ordered individually from the mint. Because of this the lowest mintage for any denomination (cent through half dollar) determines the total number of complete sets that can exist. Consequently, this number is used to indicate the mintages of proof sets for the years 1936 through 1942. Beginning in 1950 customers could order proofs coins only as complete sets, although coins were packaged as sets rather than individual coins beginning only in 1955, when the U.S. Mint sold both individually packaged coins in boxes and sealed "flat pack" sets of coins.

Sets struck from 1936–42 (1942 offered a five-coin and a six-coin version, the latter included the silver wartime nickel) and, when resumed, from 1950–72 include the cent, nickel, dime, quarter, and half dollar. From 1973 through 1981 the dollar was also included, and also from 2000 on. From 1950 to 1955, proof sets were packaged in a box and each of the five coins was sealed in a cellophane bag. 1955 saw both the original "box" packaging and introduced the flat-pack, where the coins were sealed in cellophane and presented in an envelope. The flat-pack packaging continued through 1964, after which the coins were sealed in various styles of hard plasticized cases. (From 1965 to 1967, the production of proof sets was suspended and Special Mint Sets were made in their place. They were made at the San Francisco Assay Office but bore no "S" mintmark.)

The 1999-2008 proof sets also contain five different Statehood quarters. The 2004–05 series also contain the two Lewis and Clark nickels. Beginning in 2007, full proof sets include the four Presidential dollars for that year; proof sets of only Statehood quarters and Presidential dollars are also available. Proof sets issued in 2009 contain 18 coins – the most ever included – as that year marked the Lincoln Birth Bicentennial and featured four different reverses for the Lincoln Cent. These were struck in the original metal composition of Lincoln Cents: 95% Copper and 5% Tin & Zinc, which differs from the copper-plated zinc composition of circulating Lincoln Cents used since 1982. Also included are six quarters (instead of five) issued under the District of Columbia and United States Territories quarters program, the four presidential and one native American dollar struck that year, and the five cent, dime, and half dollar coins. 2010 saw the introduction of the Lincoln Cent with the new Union Shield reverse which replaced the familiar Lincoln Memorial reverse used from 1959 to 2008. Also introduced for 2010 were the first five of the new America the Beautiful quarters program, depicting different National Parks and Monuments, one from each state, Washington D.C. and the five U.S. Territories.

The U.S. Mint has also released special proof sets, such as in 1976, when a proof set of three silver-clad coins: the quarter, half-dollar and dollar coins depicting special reverses to commemorate the U.S. Bicentennial was issued. From 1971 to 1974, proof silver-clad Eisenhower dollars were issued in a plastic case contained in a brown wood-grain finish slipcase box, and are referred to as 'Brown Ikes'. Proof Susan B. Anthony dollars were struck in 1999. Although these proof dollars were sold separately and not included in the proof sets for that year, some third parties used the cases from other years to create 1999 proof sets that include the dollar, prompting the U.S. Mint to advise the public that these sets were not government-issued sets. A proof "Coin & Chronicles" set was issued for 2009, which included one each of the 4 different Lincoln Cent designs and a commemorative Lincoln Silver Dollar, presented in special packaging. Other sets, called "Prestige Proof" sets, also contain selected commemorative coins. These sets were sold from 1983 to 1997 (except 1985) at an additional premium. As Legacy Proof sets, the practice was resumed from 2005 to 2008.

Occasionally, there are errors which escape the Mint's inspection process, resulting in some very rare and expensive proof sets. This has happened at least seven times: 1968-S, 1970-S and 1975-S and in the 1983-S Prestige set, each with a dime that has no mint mark; a small number of 1971-S sets included a nickel without a mint mark; 1990-S saw both regular and Prestige sets which included a penny with no mint mark.

Not as rare (or expensive) are proof sets issued with coin varieties that are less common than those found in other sets issued in the same year. These include the 1960 and 1970-S sets, both of which are found in either a "small date" or "large date" variety, which refers to the size and position of the date on the Lincoln cent. The 1979-S and 1981-S sets each come in either a "Type I" or a "Type II" version, where on all coins the "S" mint mark is either "filled" (also known as the "blob" mint mark) or "clear". 1964 has a design variation where the President's portrait on the Kennedy half-dollar has "accented hair". The design was modified early in the production (at the request of Jacqueline Kennedy) to give the hair a smoother appearance. This resulted in the "accented hair" variety being somewhat rarer and commanding a premium over the "regular" variety.

Since 1992 the mint has struck proof sets in both silver and base metal. Also, "Silver Premier" sets, featuring deluxe packaging, were offered from 1992 to 1998. U.S. commemorative and bullion platinum, gold, and silver coins are also often issued in both uncirculated and proof types, sometimes with different mint marks.

In most years since 1947 the U.S. mint has also produced "mint sets", and because of the terms used there is some confusion over the difference between these and proof sets. These are uncirculated coins that have been specially packaged, and (unless a scarce coin is included) are generally neither as expensive nor as valuable as proofs. From 1965-67 the mint did not sell proof or uncirculated coins, but only a hybrid product, "special mint sets", none of which are particularly valuable. From 2005 through 2010 the U.S. Mint used a special "satin finish" on the coins in its uncirculated sets, but in 2011 changed to a "brilliant finish" so that contact marks incurred during the normal production process would be less noticeable. Some U.S. mints also sell annual "souvenir sets" from their production runs. These are generally not of high collectable value, although the 1982-83 sets are in demand, since no "official" mint sets were issued during those years. Finally, individual dealers have made unofficial "year sets". The latter have no value beyond their individual coins. Members of the public should be careful to understand what products they are being offered, and that, until supplies are exhausted, current and previous coin sets are available directly from the mint.