Scott US 2256.
The stamp is not from 1920, that is the era of the wheel chair pictured. It can be purchased mint for 80 cents and used for 20. A dealer is not likely to want to purchase a single copy.
You will have to identify what stamp you have as there were many issued or available in 1920. Consult a catalog, Gibbons or Scott to identify the item you have. It will also provide an estimated value for you.
5318008
The Old Arm Chair - 1920 is rated/received certificates of: UK:A
Gerhard Stamp was born on 1920-06-03.
Four cents for a one ounce First Class letter.
In the 1920's you could by a stamp for 1-3 cents a stamp.
The cast of The Church with an Overshot Wheel - 1920 includes: Ethel Fleming
How much is 200 pound sterling worth in 1920
The price of a First Class Stamp in the US in 1920 was 2 cents. It was good for one ounce of First Class Postage. It went up to 3 cents in 1932.
How much is 200 pound sterling worth in 1920
$105 million in 1920 was worth about $1,244,340,000 in 2015.
2 cents in the U.S.