There are a dozens of stamps issued in the 1980s. You will have to consult an online catalog for information to figure out which one you have. That will provide you an estimate on the value.
That is Scott number us 1844 issued in 1980. This stamp has minimal value and can be purchased mint or used for 15 cents, the lowest price to cover handling. Consulting a good catalog will help you properly identify the specific stamp and find an estimated value for it.
$1 in 1980 was worth $2.61 in today's money.
Face value.
The lowest value US stamp was the 1/2 cent. A couple different versions were issued.
That is Scott number us 1844 issued in 1980. This stamp has minimal value and can be purchased mint or used for 15 cents, the lowest price to cover handling. Consulting a good catalog will help you properly identify the specific stamp and find an estimated value for it.
A US first class stamp dated 2002 is worth face value only, and it's still valid now.
If it says US Addresses Only it is good for 32 cents worth of postage. The Make Up stamp is worth 3 cents.
This stamp is called an F makeup. It is worth 4 cents. It was issued in 1991 along with the F stamp which had a value of 29 cents
The Liberty Bell is pictured on the Forever Stamp. They are worth the current value of a first class stamp, which is 44 cents in 2009. They can only be used for US addresses.
The F series stamps were issued in 1991. The postage stamp has a face value of 29 cents.
The value of US commemorative stamps varies depending on type and issue guide. They can range anywhere from a minimal value for a used stamp to thousands of dollars for a rare mint condition stamp. There are many US stamp price guides that can be obtained to find out a catalog value. Stamps in the US that are unused can always be used for face value as postage.
In used condition it is not worth anything. In mint condition it is probably worth 2 times the face value.