The stamp you are referring to is listed in the Scott Catalogue:
Scott 1542
Single mint is valued at $0.20
Single used is valued at $0.20
It was first issued on June 15, 1974
Unfortunately, the value on the open market is not more than the face value of $0.10. Most still just use it as postage!
A first-class stamp is not the same as a forever stamp. A forever stamp holds the value of a first-class stamp regardless of how often the rate for first-class postage has increased. A first-class stamp only holds its face value.
It is a forever stamp. It is good for the current value of a first class stamp.
That stamp was issued in 2005. It has a face value of 25 cents.
That is the F stamp and came out in 1991. It has a face value of 29 cents.
A first class stamp is 44 cents as of 2010.
First Class is 44 cents
Cost of a postage stamp was dependent on the face value of the stamp. The most common rate stamp is for First Class Mail. In the United States 1922 that was 2 cents for the first ounce.
Cost of a postage stamp was dependent on the face value of the stamp. The most common rate stamp is for First Class Mail. In the United States 1960 that was 4 cents for the first ounce.
Cost of a postage stamp was dependent on the face value of the stamp. The most common rate stamp is for First Class Mail. In the United States 1929 that was 2 cents for the first ounce.
Scott 1271 was a commemorative a Spanish Explorer. This 5 cent stamp was issued in 1965. It can be purchased in mint condition for 50 cents and used for minimal value.
A postcard stamp looks like a first class stamp, only it has a smaller value. The size of the stamp is one inch by one inch.
About a $1.