How do you find the value of unused postage stamps from prior years with no stated value on the stamp?

Question

How do you find the value of unused postage stamps from prior years with no stated value on the stamp?

Answer 1

Check the following link. It contains photos of every US non-denominated stamp ever issued, and tells you what the denomination is:

http://www.knottywood-treasures.com/id39...

Answer 2

I use to work as customer service for the post office.  Call 1-800-ASK-USPS.  Describe the postage stamp to them, they can pull it up and give you the value of it over the phone.  The call may start off as an automated robot talking but if you keep giving it the wrong answer it will transfer you to a live human being.