What is the value of a silver certificate cast in 1957A?

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?".