There was a time right on up until the mid 1960's when you could take any "silver certificate" and trade that note for actual silver dollars. Silver certificates are a type of representative money issued between 1878 and 1964 in the United States as part of its circulation of paper currency. They were produced in response to silver agitation by citizens who were angered by the Fourth Coinage Act, which had effectively placed the United States on a gold standard.   The certificates were initially redeemable for their face value of silver dollar coins and later (for one year – June 24, 1967 to June 24, 1968) in raw silver bullion.   Since 1968 they have been redeemable only in Federal Reserve Notes and are thus obsolete, but still valid legal tender and thus are still an accepted form of currency.

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