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2. Challenge coin - Wikipedia

   en.wikipedia.org/wiki/Challenge_coin

   A challenge coin is a small coin or medallion, bearing an organization's insignia or emblem and carried by the organization's members. Traditionally, they might be given to prove membership when asked and to enhance morale. They are also collected by service members and law enforcement personnel.

3. Coin slab - Wikipedia

   en.wikipedia.org/wiki/Coin_slab

   Coin slab. Coin slab is a type of holder for a coin. Slabbed coins are typically from one of the coin grading companies. The practice of sending coins to third-party grading companies and then "slabbing" them began in 1986. When a grading company grades the coin it is sealed in a tamper proof slab with a barcode and a hologram.

4. Change-making problem - Wikipedia

   en.wikipedia.org/wiki/Change-making_problem

   Change-making problem. The change-making problem addresses the question of finding the minimum number of coins (of certain denominations) that add up to a given amount of money. It is a special case of the integer knapsack problem, and has applications wider than just currency. It is also the most common variation of the coin change problem, a ...

5. Coin shows in the United States - Wikipedia

   en.wikipedia.org/wiki/Coin_shows_in_the_United...

   A coin show is an event where coin collectors and coin dealers attend to buy, trade and sell coins. [1] Like other hobby shows, a show hall is arranged with aisles and tables where coin sellers can display their coins. In cities across the United States there are thirty to fifty smaller local shows each weekend.

6. Coin folder - Wikipedia

   en.wikipedia.org/wiki/Coin_folder

   Coin boards were a huge success as they offered collectors of all types a way to store their coins inexpensively. The modern day coin folder's invention is disputed by two major rivals. One take has that the folders were invented by R.S. Yeoman of The Whitman Company just before World War II. Yeoman took the old penny board design and simply ...

7. Coin storage - Wikipedia

   en.wikipedia.org/wiki/Coin_storage

   Coin storage. 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 depend on a few different requirements such as; protection from oxidation and other chemical damage, protection from ...