A used stamp is seldom worth more than a mint stamp. However, that can vary considerably. The stamps of some countries, such as Tonga, are worth more used then mint. And a used stamp on an envelope could be worth a great deal depending on the cancellation and other factors.
mint means it is unused, no one gave it the lick!
Mint - face. Used - nothing.
All and every mint stamp of the US issued since 1861 can still be used for postage.
This stamp is Scott # 1391. It has a catalog value of 20 cents mint or used.
If the stamp has not been devalued by the country of issue, yes, for postage in that country. It is only going to be worth face value which could be a fraction of its actual value in a few cases.
The value of an Anna Julia Cooper postage stamp would depend on various factors such as its condition, rarity, and demand among collectors. On average, a mint condition Anna Julia Cooper stamp could be worth anywhere from a few dollars to potentially over $20.
For a self-adhesive stamp, no it should not be removed. Mint means it is still capable of being used for postage.
Which one? There are 30 US stamps printed with Andrew Jackson.
This is a very common stamp - practically worthless used. Worth face value mint if you need it for postage or if you can find a collector who wants it for his collection. A dealer would charge up to 20 cents for it.
That would be Scott number US 1906. It has a catalog value of 20 cents used and 35 cents mint.
That would be US Scott Number 2097 It has a minimal value of 20 cents used and $1.50 in mint condition.
US Scott Number 1 issued in 1847. It has a Catalog value of $6,500 mint and $600 used.
Catalogue value for a .76cent Hattie Caraway mint (in excellent shape) 1.50 . A used one is .20c