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apollo 13
The reason was because Apollo 13 followed Apollo 12.
The whole program was named after the god Apollo, not just Apollo 13.
Apollo 13 was built at N.A.S.A.
Apollo 13 did not crash.
10c
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.
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.
13 cents. See the website below.
The price of a First Class Stamp in 1976 was 13 cents. It was good for one ounce of First Class Postage. It went up from 10 cents in 1975.
It will depend greatly on which bicentennial stamp your have. The first class rate then was 13 cents and it can still be used for that value in postage. For a collectors value you will have to identify it using a catalog.
It is worth $21
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.
That will depend on the specific Canadian stamp that you have. The condition, cancellations, what it is attached to, watermarks, perforations and even color variations can affect the value. You will have to consult a postage stamp catalog to find out.
In 1980, the value of a first class stamp in the US was 15 cents.
apollo 13
In general these are fairly common. Minimal value for this stamp indicates that the cost is in packaging and tracking and not the stamp itself. There are going to be specific issues with a bit more value, but you will have to identify the stamp and look it up in the catalog.