Folding Coin/Coin In Bottle - Half Dollar
Folding coins have so many uses that it would be impossible to list them all.
The most popular is the coin in the bottle.
Magician magically places a coin inside a bottle being held by a spectator and then removes it and passes it around for examination.
A real mind blower!
There are many other uses for folding coins and a lot of books are available on the subject.
Also available - half dollar profile, quarter.