Williamsburg, Pennsylvania based manufacturer of <#stampenv=stamped envelopes> from 1964 to 2008.

a <#block> of <#stamp=stamps> from the 1943-1944 <#overrun=Overrun Countries Issue> (<#scott=Scott> 909-921) with a country name in the location where a <#pn=plate number> is customarily located.

a campaign by the <#uspod=Post Office Department> to promote <#airmail=air mail>, conducted May 15-21, 1938, the twentieth anniversary of regularly scheduled air mail service.  A large variety of <#cachet=cachets> and special flights were used in this observance.

See <#seal=Seal>.

successor to the <#rms=Railway Mail Service> in 1949 with responsibility for the transportation of mail by land, sea, and air.