What is the value of 1914 US 50 dollar Federal Reserve note?

As of 02/2015 approximate prices are:

Blue Seal -

Circulated: $150 to $400 depending on the bill's condition

Uncirculated: $600

Red Seal -

Circulated: $1000 to $2000 depending on the bill's condition

Uncirculated: $4000

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.