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Article #102: On Mints and Mint Marks By Eric Weisbrot

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Mint Marks are tiny letters referring to approximately the dimension of the done
the locality where the minting of coins coin.
took place. The position of mint mark can 3. The blanks then are softened by
be found typically on the back side of running them through an annealing
coins that were minted before the year furnace, through tumbling barrels, and
1965 and on the front after the year then through revolving cylinders
1967. containing chemical mixtures to burnish
Coins of every US mint branch are and clean the metal.
recognized by mint marks. These coin 4. The blanks then are washed and placed
marks date back to ancient times in Rome into a drying device, then into the
and Greece. upsetting machines, that produce the
The Director of the Mint, through the Act raised rim.
of March 3, 1835, set rules to classify 5. The Final stage: coining press. Each
and distinguish the coins released from blank is clasp into position by a collar
every US Mint branch. This core or ring as it is being struck or hit
management set accurate standards and under great pressure. Pennies need
pattern of production as well as approximately 40 tons of pressure and the
responsible coinage. larger coins need more. The upper and
Coins that minted at the Philadelphia lower dies are stamped simultaneously on
mint earlier than the year 1979 have no the two sides of each coin.
mint marks. So it was in that year that The design:
the dollar was marked with the letter P The Director of the Mint chooses the
and other denominations had that same design and pattern for United States
mark thereafter. coins, then that is approved by the
All dies for US coins are produced at the Secretary of the Treasury; congress can
Philadelphia Mint and prior to shipping recommend and suggest a design. The
the coins to their mint branch, coins are design then can not be changed for twenty
marked first with the correct and five years unless directed by the
designated mint markings. The precise congress.
size and positioning of the coins mint All emblems of United States coins minted
mark can slightly vary; this is currently represent previous presidents
influenced by how deep the punch was of the United States. President Lincoln
impressed and where. is on the one-cent coin, adopted in the
The importance of mint marks: year 1909; Washington on the 25 cent coin
Collectors can determine the value of a that was minted first in 1932; Jefferson
coin though mint mark, date and condition on the five cent coin in 1938; Franklin
examination, making the coins condition Roosevelt on the dime, introduced in the
the most significant factor and standard year 1946; Kennedy on the half dollar
when determining its value. that was first minted in 1964.
Defining the Mint which hit the coin is The Act of 1997 known as the 50 States
tremendously important in determining the Quarters Program supports and allows the
value of the coin; the coin can be hit in redesigning of the quarters - the reverse
huge quantities at a single Mint or in side is to show each of the fifty states
smaller quantities in another hit. emblems. Every year starting in 1999 and
The process of minting: until 2008, coins honoring five states,
1. The making of metal strips in the having designs that are created by each
correct thickness: Zinc strips are used state, will be issued in the sequence or
for pennies, alloy strips composed of manner in which each state signed the
nickel (25%) and nickel (75%) for nickel Constitution.
and dollars, half-dollars, dimes, The phrase In God We Trust was used first
half-dimes are fabricated from a fusion in 1864, on a United States two-cent
of three coatings of metals; the external coin. It then was seen on the quarter,
layer are alloys and the center is nickel, half-dollar, silver dollar and on
copper. the $10, $5 and $20 in 1866; in 1909 on
2. These strips of metals are then put the penny, in 1916 on the dime. Today,
into blanking presses that are all United States coins carry the motto.
responsible for cutting round blanks,






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