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2. Coin capsule - Wikipedia

   en.wikipedia.org/wiki/Coin_capsule

   Two halves of a coin capsule 1884 Morgan Dollar in a coin capsule. A coin capsule or is a type of plastic capsule designed to prevent coins from becoming damaged by protecting it from outside contaminants, scratches and drops while allowing the coin to be viewed through transparent plastic.

3. Coin storage - Wikipedia

   en.wikipedia.org/wiki/Coin_storage

   An 1886-S Gold eagle in a PCGS plastic coin slab A 1/10th troy ounce American Gold Eagle in a cardboard '2x2' flip, secured with staples A coin folder offers no protection from the elements and is likely to damage coins when pressed in or popped out. Coin collectors have various options for storing their coin collections. The various options ...

4. Coin collecting - Wikipedia

   en.wikipedia.org/wiki/Coin_collecting

   For tiered fees, certification services grade, authenticate, attribute, and encapsulate coins in clear plastic holders. [27] [28] [29] Coin certification has greatly reduced the number of counterfeits and grossly over graded coins, and improved buyer confidence. Certification services can sometimes be controversial because grading is subjective ...

5. United States Mint coin sizes - Wikipedia

   en.wikipedia.org/wiki/United_States_Mint_coin_sizes

   The figures cited in the tables are representative of the series, and are generally the latest, or most common, figures for a given coin type. The largest coin ever minted by the US Mint was the 2019 Apollo 50th anniversary 5ounce silver dollar, weighing 155.517 grams, and 76.2 mm in diameter. [5]

6. Coin wrapper - Wikipedia

   en.wikipedia.org/wiki/Coin_wrapper

   A coin wrapper, also known as a bank roll or simply a roll, is a paper or plastic container designed to hold a specific number of coins. During 19th century, newly minted coins were collected in cloth bags. Initially, coin wrapping was a manual process. Since the onset of the 20th century, coin wrapping machines have been in use.

7. Coinage shapes - Wikipedia

   en.wikipedia.org/wiki/Coinage_shapes

   An example of such a coin with a fairly large hexagonal hole is a undated tin 1 cash coin, minted in the period 1550–1596, that circulated in the Banten Sultanate on Java and Sumatra . [56] Also, several tin 1 pitis coins with exceptionally large round holes, of which some were made in octagonal coins, were used in Jambi Sultanate on Northern ...

8. Tube (container) - Wikipedia

   en.wikipedia.org/wiki/Tube_(container)

   A tube, squeeze tube, or collapsible tube is a collapsible package which can be used for viscous liquids such as toothpaste, artist's paint, adhesive, caulk, & ointments. Basically, a tube is a cylindrical , hollow piece with a round or oval profile, made of plastic , paperboard , aluminum , or other metal.

9. Coin rotation paradox - Wikipedia

   en.wikipedia.org/wiki/Coin_rotation_paradox

   The outer coin makes two rotations rolling once around the inner coin. The path of a single point on the edge of the moving coin is a cardioid.. The coin rotation paradox is the counter-intuitive math problem that, when one coin is rolled around the rim of another coin of equal size, the moving coin completes not one but two full rotations after going all the way around the stationary coin ...