The stamp has a face value of 20 cents, so it ought to be worth at least that. Scott #1289 It can be purchased for fifteen cents used and 90 cents mint. Dealers seldom wish to deal with single stamps. They might give you a quarter for a mint copy.
The US has issued dozens of George Washington stamps, many with a value of 2 cents. You will have to completely identify the stamp to find a value. A catalog, available in most libraries can help you determine the value. Chances are a dealer won't purchase a single stamp unless it is worth more than a dollar or two.
This would be Scott number US 651. It has a value of $2.25 in mint condition and $1 in used condition.
The US has issued dozens of George Washington stamps, many with a value of 3 cents. You will have to completely identify the stamp to find a value. A catalog, available in most libraries can help you determine the value.
Barely, probably the face value of the stamp.
It was George Washington on the 10 cent stamp in 1847.
George Marshall
The D stamp has a face value of 22 cents and can be used on domestic mail at that value.
This stamp is a common US commemorative stamp. Mint US stamps are worth their face value to use as postage, so you can use yours that way, if you need postage. Otherwise, your stamp has negligible value ( less than 25 cents retail) , but please do not throw it away! Keep it in your stamp collection for your children or yourself when you have more time. If you have more than one, you may be able to trade it for stamps of similar value. . Or give it to a collector friend. Collectors always appreciate the thought even if they do not need the stamp.
15 cents.
Forever
value is 25 cents
The F series stamps were issued in 1991. The postage stamp has a face value of 29 cents.