Cachet

Cachet - In philately, a printed decoration on mail matter (such as a design or inscription), often referring to the new postage stamp on a first day cover. The design can be hand-created, printed, rubber-stamped, or pasted, usually on the front left side of the envelope.

[Category=Postal ]

Source: USPS, 01 September 2009 09:23:51, http://www.usps.com/cpim/ftp/pubs/pub32/pub32a_g.html

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cachet - Special design or inscription on an envelope to commemorate a postal or philatelic event relating to the stamp, an advertisement forming part of a postage meter impression, or a motto or slogan included in a postal cancellation. [flamme]

[Category=Postal ]

Source: Canada Post, 24 December 2012 11:00:03, http://www.canadapost.ca/tools/pg/glossary-e.asp