What is the value of a US 100 dollar bill with a red seal?

Answer 1

Red-seal $100 notes were issued at various times from 1862 to 1966, so your question needs more detail to give a definite answer. You'll need to know the bill's date, how worn it is, and whether there is a small letter to the right of (or below) the date. Once you have that information you can either post a new question or check a site such as the one linked below to get an idea of its retail value.

You don't need to copy out the serial number because it doesn't help to identify a bill.

To explain the red ink, up till the mid-1960s the US issued an alternate form of currency called United States Notes. The smallest denomination was $2 and the largest was $100. They were identifiable by having those words across the top of the bill and red serial numbers and seals. US Notes were discontinued as a cost-saving measure because they were no different in purpose and function from green-seal Federal Reserve Notes.