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2. Coining (metalworking) - Wikipedia

   en.wikipedia.org/wiki/Coining_(metalworking)

   1818 engraving depicting the coining press as used in the Royal Mint. Coining is a form of precision stamping in which a workpiece is subjected to a sufficiently high stress to induce plastic flow on the surface of the material.

3. Coining (mint) - Wikipedia

   en.wikipedia.org/wiki/Coining_(mint)

   A coin die itself, has been the main motive for many collectors coins and medals. One of the most recent and famous one, is the Austrian 700 Years City of Hall in Tyrol coin, minted on January 29, 2003. The reverse side of the coin shows the Guldiner silver coin. However, the design is negative, representing a coin die, as a reference to Hall's ...

4. Ring cent - Wikipedia

   en.wikipedia.org/wiki/Ring_cent

   The ring cent or holey cent was a one-cent pattern coin first struck in various compositions and designs between 1850 and 1851 as part of an experiment on producing a cent with a reduced weight and diameter, as the rising price of copper had caused cents to cost more than their face value to produce.

5. Coin edge - Wikipedia

   en.wikipedia.org/wiki/Coin_edge

   Reeding of edges was introduced to prevent coin clipping and counterfeiting. [2] [3] The main techniques of coin edging are edge mills of various types, which put a pattern on a smooth edge, after a coin and coin mills with edge rings, which pattern the edge at the time when the coin is being milled.

6. Hobo nickel - Wikipedia

   en.wikipedia.org/wiki/Hobo_nickel

   An altered British penny. The altering of coins dates from the 18th century or earlier. Beginning in the 1850s, the most common form of coin alteration was the "potty coin", engraved on United States Seated Liberty coinage (half dime through trade dollar) and modifying Liberty into a figure sitting on a chamber pot.

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