What is the value of an 1880 US 1 dollar bill?

Answer 1

As of 07/2014 approximate prices are:

With a brown seal -

Circulated: $150 to $1200 depending on the bill's condition

Uncirculated: $950 to $3500 again depending on condition

With a red seal -

Circulated: $100 to $1000

Uncirculated: $500 to $2500

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.