privately produced, fund raising <#label=labels> intended for use on mail during the Christmas season.  First issued in 1907.  <#scott=Scott> numbers are prefixed with WX.

a printing <#variety> on a <#stamp> that is the result of <#chrome=chrome plating> stripping off a printing <#plate>.  See <#cs=CS>

<#revenue=revenue stamps> used the pay a tax on cigarette paper.  <#scott=Scott> numbers are prefixed with RH.

a nickname frequently used for fantasy <#label=labels> with no postal validity.

circular <#postmark>, which generally contains the city and state of mailing as well as the date and time the postmark was applied.