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
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.
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.
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.
$105 million in 1920 was worth about $1,244,340,000 in 2015.
How much is 200 pound sterling worth in 1920
2 cents in the U.S.
1920-20=
it is worth $574,468 U.S