Identifying the stamp is pretty difficult, given that Jefferson has been on many stamps, but being you went through the trouble to ask the question in the 1800's section under Stamps, Tomas Jefferson, Decade - one should assume you are speaking of a Stamp from that period.
You would need to fully identify the stamp, including watermarks, special markings, condition and other factors to know the exact value. This is something the average person is going to find very difficult if not impossible.
For more information, find a philatelist (a person who specializes in stamps) and ask!
According to the website United States Non-denominated Stamp Values, the face value is 37 cents.
The price of a stamp went from 15 to 18 cents. So the face value of the B stamp is 18 cents. The B make up stamp would be worth 3 cents.
The D stamp would have a face value of 22 cents. There was a make up rate stamp with a value of 2 cents.
A G stamp has a face value of 32 cents. You would have to add 27 cents to mail a letter with it.
The tulip stamp was marked as the F Flower stamp. It has a face value of 29 cents.
A= 15 cents B= 18 Cents C= 20 cents D= 22 cents E= 25 cents F= 29 cents G= 32 cents H= 33 cents
22 cents
The stamp-postage value of a stamp is visible on the front of the stamp.
The A series stamp pictures an eagle. It has a face value of 15 cents.
The H stamp was the one with the Hat on it. It has a face value of 33 cents.
An E stamp is a picture of Earth. It has a face value of 25 cents.
The face value of the D stamp was 22 cents when issued in 1985.