What is the value of a 1953 A US 5 dollar bill with a red seal?

As of 03/2011 approximate prices are:

Circulated: $5 to $9 depending on the bill's condition

Uncirculated: $12

Despite its age and unusual design, these bills were common at the time and aren't considered to be rare. The red seal indicates it's a United States Note, a form of currency printed up till about 1971.

Serial Numbers

A bill's serial number is a counter and a security feature. In most cases it doesn't affect a bill's value or help to identify it. Some collectors specialize in bills with low serial numbers (e.g. 00000005) or unusual patterns (12344321) so these can bring above-average prices.

DISCLAIMER: The values quoted are market averages as of the date shown, but may be different for an individual bill due to variations in quality and other factors. Also the wholesale (buying) price of a bill will be less than the selling (retail) price. A reputable currency dealer will be able to give a more accurate valuation based on an in-person inspection.
Despite its age and now-unusual design, 1953 $5 U.S. Notes are common among collectors.

As of 07/2009 auction prices for a circulated bill range from face value to $9 depending on condition. Uncirculated ones go for $12 or more, however.