What is the value of a blue seal five dollar bill with a letter a next to the serial number?

Hello,

You can get up to $12 for that Five Dollar Bill, hope this helps

Yes, no, maybe ...That description isn't specific enough to identify the bill for valuation. The blue seal indicates that the bill is a silver certificate and the "A" indicates that it was printed after either a new Secretary of the Treasury or US Treasurer was appointed during the duration of that particular series. However, there were both 1934-A and 1953-A bills and they have different values. Please see the Related Questions for more information.