<#perf=perforation> holes that are larger than other perforations holes of the same gauge.  For example, <#scott=Scott> 1055 in the <#liberty=Liberty Series> exists with perforation holes of two different sizes (large and small) even though all are perforation gauge 10.  Compare: <#smallholes=Small Holes>.

a <#uspod=USPOD> service that lasted six weeks in 1960.  It was a “fax” service for inter-agency mail, which the Post Office delivered in specially designed envelopes.

<#perf=perforation> holes that are smaller than other perforations holes of the same gauge. For example, <#scott=Scott> 1055 in the <#liberty=Liberty Series> exists with perforation holes of two different sizes (large and small) even though all are perforation gauge 10.  Compare: <#largeholes=Large Holes>.

a territory leased to the United States from 1904 to 1979 and for which <#stamp=stamps> were issued.  Those stamps include <#overprint=overprinted> issues of Panama and the U.S., and stamps designed and printed specifically for the Canal Zone by the <#bep=Bureau of Engraving and Printing>.

a numeral placed on a <#stamplessletter-gen=stampless letter> at its place of origin indicating the amount to be collected from the addressee.