What denomination is an "A" stamp from the US Postal Service?

Zbeckabee

The US "A" stamp was valued at 15 cents (US$0.15) when it was issued on May 22, 1978. In past years, non-denominated postage issued by the United States differed from the issues of other countries, in that the stamps retained their original monetary value. Some stamps, such as those intended for local or bulk mail rate, were issued without denomination. This practice began in 1975, when there was uncertainty as to the timing and extent of a rate increase from ten cents for the first ounce of first class postage as the end of the year approached. Christmas stamps were released without denomination, giving the United States Postal Service flexibility to refrain from reprinting hundreds of millions of stamps in a new denomination. The rate increase, to thirteen cents (US$0.13), occurred just after Christmas. The United States also issued stamps with letter denomination, beginning from A, B, etc., during postal rate changes. After reaching the letter "H", this practice was discarded in favor of simply indicating the class of postage (e.g., first class) for which the stamp was intended. http://en.wikipedia.org/wiki/Non-denominated_postage Jul 23 10, 10:45 AM