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About 13 cents...
Most dealers are not going to be interested in buying a single stamp. You might try selling it on an auction site, but the postage cost will be more than the value of the stamp.
7.50
These were issued January 11, 1926.
There is an 11 cent stamp in the presidential series which was current from 1939 to 1954. First class postage was never 11 cents-it jumped from 10 cent directly to 13 cents.
It is worth $21
For the years 1978 & 1979 the cost of postage was 15 cent.
I believe you are describing Scott Number 1734, a 13 cent stamp. Issued in 1978, you can purchase a new copy for 65 cents. A used copy will cost you 15 cents. You would be lucky to get 15 cents for a mint copy, as most dealers won't work with a single copy of a stamp at such small value.
2 Dollars
This is the forever stamp -- its value as postage remains at the current first class rate. Even when the rate goes up, it can still be used without additional postage. Now it is the same as a 42 cent stamp-- after May 11, it becomes a 44-center.
In 1867 the US issued its first 15 cent stamp. They have been available ever since then. In May of 1978 the rate for first class postage in the US was raised to 15 cents. It stayed at that rate until March 1981.
There was never a 12 cent stamp for regular postage. It went from 10 cents to 13 cents on 12/31/1975. There was however a postage card stamp for 12 cents in 1981.