Coins are struck or minted using solid metal blanks sent through a coin press. Statues are cast using a mould and molten metal.
In any case your coin is a bullion piece sold for its silver content and not for spending. Its value depends on the price of 1 oz. of silver, which changes daily. Check the business section of a newspaper or Google "silver spot price" (without the " marks, of course).
Since silver certificates have not been produced since the 1960's, I assume that you're asking about a privately issued ingot that is cast in the shape of a dollar bill. I would guess that it is worth its bullion value (silver as of October 9, 2007 is $13.45 per troy ounce).
1.489 oz
If you think about it for a few seconds, casting involves pouring molten metal into a mould, a process that wouldn't lend itself very well to something made from paper and ink. US paper money is printed, much like newspapers and books.There's more information the at question "What is the value of a 1957 US 1 dollar silver certificate?".
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To clear things up:US paper bills are printed, not "cast". "Casting" involves pouring molten metal into a mould; that would not work very well if paper and ink were used.1957A is not the date the bill was printed; it's a "series date" indicating that the bill was part of the second set of $1 bills printed starting in 1957. It's the second set because a new Treasury Secretary and US Treasurer had taken office since the start of the 1957 series.There's more information at the question "What is the value of a 1957 A US 1 dollar silver certificate?".
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They are silver
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