As of February 10, 2014, the most expensive butterfly stamp available in the United States of America, the Great Spangled Fritillary Butterfly stamp, would cost seventy cents (70¢, US $0.70): 21 cents more than basic first-class letter postage (49¢).
In mexico, Our money is worth 30x more than are money in the US of A !
50 cents if unused. Nothing if used.This must be the most common US airmail stamp.
It is called a catalog. In the US, Scotts Postage Stamp Catalog is most popular.
That depends on many factors. A stamp is worth its face value for use as postage. If you have something that is old and is rare, it could be worth some money. Today's First Class postage stamps are 44 cents.
This stamp is called an F makeup. It is worth 4 cents. It was issued in 1991 along with the F stamp which had a value of 29 cents
Today (February 4, 2015) it is worth 80 cents US.
.75
$0.20
The lowest value US stamp was the 1/2 cent. A couple different versions were issued.
Worth 6 cents
America's money is worth more than foreign money, so most foreign money is not worth anything to us, this coin for instance is only worth 25 cents here and a dollar there
If you mean the US stamp, it was issued 1990 and about mint .65c used .20c