service for a fee that provides evidence of mailing.  Certificates of Mailing were first made available in 1915.

service for a fee that provides a mailing receipt and maintenance by the <#usps=USPS> of a delivery record.  Certified Mail requires the signature of the recipient.  First offered in 1955.

a stamp issued in 1955 to pay the fee for <#certmail=Certified Mail>.  <#scott=Scott> FA1.

the bits of paper removed in the <#perf=perforating> process.

series of <#commem=commemorative>  <#poststamp=postage stamps> (late 1950s to early 1960s) honoring foreign nationals who sought freedom in their homelands.  Example: <#scott=Scott> 1125.