<#quantity=quantity> mail that is <#rate=rated> by bulk (aggregate weight), rather than by the piece, although minimum per-piece rates apply.

a <#stamp> on which the <#postmark> is struck directly on the center of the <#stamp>.  Also known as "<#sotn=socked-on-the-nose>."

a product of the <#bep=Bureau of Engraving and Printing>.

former name of the <#usss=United States Stamp Society>.

a division of the U.S. Treasury Department with production facilities in Washington, D.C. producing almost all <#stamp=stamps> from 1894 through the 1960s.  Since 1967 the BEP shared the production of stamps with a wide variety of private companies.  Production of stamps by the BEP ended in 2005.