<#marginmark=marginal marking> meaning "Chromed Steel" indicating that a <#plate> has been chromium plated.  Example: Georgia Bicentennial Issue (<#scott=Scott> 726). See also: <#chrome=Chrome Plating> and <#chromestain-gen=Chrome Stain>.

see <#csac=Citizens' Stamp Advisory Committee>.

1.) any text or graphic applied to an envelope for a commemorative purpose.  Cachets are frequently found on <#fdc=First Day Covers>, <#patrioticcover-gen=Patriotic Covers> and <#event=Event Covers>.  2) any advertisement, censor marking or commercial handstamp applied to a cover.

subcontractor to <#stampven=Stamp Venturers>.  Example: 1992 29¢ Earl Warren <#defin=definitive>  <#poststamp=postage stamp> (<#scott=Scott> 2184).

any <#postalmark=postal marking> applied to a <#stamp> to prevent its reuse.  Cancellation is not synonymous with <#postmark>, although the two terms are frequently confused and used interchangeably.  Cancellations have been applied by <#handstamp=handstamps>, <#machcancel=machine>, including <#sprayon=sprayed on>, and pen or marker