The blue seal indicates that your bill is a silver certificate, a form of currency that's no longer issued. The 1957 B series date also indicates it was printed in the early 1960s, just before the government stopped printing silver certificates.
In spite of its age and the fact that they're no longer printed, late-date silver certificates are very common among collectors. As of 04/2010, a circulated one is worth only about $1.25.-$1.50 at auction, while a nice uncirculated one might sell for $3-$4.
Please see the Related Question for more about silver certificates.
At least one dollar
Please check your bill again. It's a $1 bill; the blue seal indicates it's a silver certificate. There's more information at the Related Question.
Please check your bill again and post a new, separate question. There were no 1957 $5 bills, only $1 bills, and they all have blue seals.
Please check your bill again and post a new, separate question. Only $1 bills were printed with the 1957 date and they were blue-seal silver certificates.
All silver certificates printed from 1928 to 1957 had blue seals. Please see the question "What is the value of a 1957 A US 1 dollar silver certificate?" for more information.
At least one dollar
Whats the value of a 1935g one dollar bill with blue writing on it
Please check your bill again. It's a $1 bill; the blue seal indicates it's a silver certificate. There's more information at the Related Question.
Please check your bill again and post a new, separate question. There were no 1957 $5 bills, only $1 bills, and they all have blue seals.
Please check your bill again and post a new, separate question. Only $1 bills were printed with the 1957 date and they were blue-seal silver certificates.
All silver certificates printed from 1928 to 1957 had blue seals. Please see the question "What is the value of a 1957 A US 1 dollar silver certificate?" for more information.
One dollar and 27 cents.
The blue seal indicates your bill is a silver certificate, a form of paper money issued until the 1957 series. Please see the Related Question for more information.
Please check your bill again and post a new, separate question. No US bills are dated 1937. 1935 and 1957 are the closest dates for blue-seal $1 bills
These are very common among collectors and sell for about $1.25
Please check your bill and post a new, separate question. The US didn't print any bills dated 1965, and the last blue-seal $1 bills were in the 1957 series.
Please check your bill and post a new, separate question. The US didn't print any $2 bills dated 1957. The closest dates are 1953 and 1963. All 1957 bills were $1 silver certificates with blue seals.