20 cents extra?
The postage stamp on the envelope was colorful.
a stamp
On Cover refers to a stamp being on an envelope, canceled and used for postage. In many cases stamps are worth more on cover with special cancellations then they are mint. You should always consider carefully before removing a stamp from an envelope. It could be a First Day of Issue, or a commemorative cancellation. It might also be a special date that is related to the stamp or a historical event.
On E-Bay its selling for about 15.00
49 cents
Presuming the postage is of the correct amount, and the stamp is entirely on the front of the envelope (not 1/3 on the envelope and 2/3 over the top or side) it should not matter.
The riddle that asks what sits in a corner while traveling all around the world is about a postage stamp. You see, a postage stamp is placed on the corner of an envelope and can be sent all around the world.
You can cut it off the envelope. However, it will not be valid for postage.
Put the correct amount of postage stamp on the envelope, address the envelope and then post the envelope.
A stamp is used to indicate that postage has been paid for the envelope to be delivered by mail. It shows the postal service that the sender has paid the required fee for mailing the letter or package.
41 Cents
The postage is standard first class 1 ounce (a "Forever" stamp).