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Coins minted with a die break have a thin line or lines that are raised running across the surface of the coin. Below is a photograph of a 1954-S Jefferson nickel with a die crack along the top of the portrait of Jefferson. A die break can create coins that have deep impressions in a coin that is filled in with metal.
Regular coin, essai (pattern) and piedfort Pattern A coin minted from official dies that is not a regular issue, and intended to evaluate new alloys or designs. Patterns can be divided in three categories. 1. A coin which represents a new design, motto, or denomination, proposed but not adopted, at least for the same year.
500-Unit Nova Constellatio coin encased in a PCGS coin slab. The Nova Constellatio coins are the first coins struck under the authority of The United States of America. [1] These pattern coins were struck in early 1783, and are known in three silver denominations (1,000-Units, 500-Units, 100-Units), and one copper denomination (5-Units). All ...
On coins, milled or reeded (marked with parallel grooves) edges are used to show that none of the valuable metal has been scraped off. This detects the shaving or clipping (paring off) of the rim of the coin. However, it does not detect sweating, shake coins in a bag, and collect the resulting dust. Since this technique removes a smaller amount ...
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Experimental Japanese coins were struck in porcelain towards the end of World War II. These pattern coins were never issued for circulation, though some privately made ones circulated unofficially. The following is a list of Japanese pattern coins from the yen based currency system started under the Meiji Restoration. [1]
The US Mint researched ways to reduce or eliminate the usage of copper in cent production. The mint struck pattern coins in various metals, using the obverse design of the Colombian two centavo coin. [1] Dies were sent to various companies to test possible non-metal compositions. Patterns were also struck with modified rim Lincoln cent dies. [2]
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