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  2. Indian Head eagle - Wikipedia

    en.wikipedia.org/wiki/Indian_Head_eagle

    Composition: 90% gold, 10% copper: Gold.48375 troy oz Years of minting: 1907–1933: Mint marks: D, S.Located for 1908-D "No Motto" issues, above the leaves near the eagle's feet on the reverse; for all pieces with "IN GOD WE TRUST", to the left of the arrow on which the eagle stands Philadelphia Mint pieces lack mint mark.

  3. Dental impression - Wikipedia

    en.wikipedia.org/wiki/Dental_impression

    As the impression material is very similar to the casting material to be used, it requires the incorporation of a separating medium (e.g. sodium alginate) to aid in separating the cast from the impression. If a special tray is to be used, impression plaster requires 1–1.5mm spacing for adequate thickness. Advantages: [2] Hydrophilic

  4. Eagle (United States coin) - Wikipedia

    en.wikipedia.org/wiki/Eagle_(United_States_coin)

    The eagle base-unit of denomination served as the basis of the quarter eagle ($2.50), half eagle ($5), eagle ($10), and double eagle ($20) coins. With the exceptions of the gold dollar coin, the gold three-dollar coin, the three-cent nickel, and the five-cent nickel, the unit of denomination of coinage prior to 1933 was conceptually linked to ...

  5. American Gold Eagle - Wikipedia

    en.wikipedia.org/wiki/American_Gold_Eagle

    The 1 ⁄ 10, 1 ⁄ 4, and 1 ⁄ 2 troy oz coins are identical in design to the 1 troy oz coin except for the markings on the reverse side that indicate the weight and face value of the coin (for example, 1 OZ. fine gold~50 dollars). The print on the smaller coins is, therefore, finer and less legible than on larger denominations.

  6. American Liberty high relief gold coin - Wikipedia

    en.wikipedia.org/wiki/American_Liberty_high...

    The American Liberty high relief gold coin is a one-ounce gold bullion coin issued by the United States Mint since 2015. [1] This coin was the first 100 dollar gold coin to be issued by the US Mint. Description

  7. United States Mint coin sizes - Wikipedia

    en.wikipedia.org/wiki/United_States_Mint_coin_sizes

    Seven distinct types of coin composition have been used over the past 200 years: three base coin alloys, two silver alloys, gold, and in recent years, platinum and palladium. The base metal coins were generally alloys of copper (for 2 cent coins and lower), and copper/nickel (for 3 and 5 cent coins). Copper/nickel composition is also used for ...