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HOLLOW COIN CONCEALMENT

Hollow coins, carefully machined from two actual
 coins, blend into a pocketful of change and are
 easy to conceal. This example is made from a 
silver dollar, a rather large coin, giving it a 
relatively large capacity. Hollow coins can be 
used to smuggle small written messages, microdots 
or film. In a similar concealment, U-2 pilot 
Francis Gary Powers carried a poison-tipped needle
hidden in a silver dollar.
Source=http://www.cnn.com/SPECIALS/cold.war/experience/spies/spy.gadgets/espionage/hollow.coin.concealment.html