Fast colors: Inks resistant to fading.
Field Post Office: A military postal service operating in the field, either on land or at sea. Frequently abbreviated FPO.
Fast Colors: Inks resistant to fading.
FDC: First-day cover. A cover bearing a stamp tied by a cancellation showing the date of the official first day of issue of that stamp.
Fantail Margin - Missing marginal perforations from edge of stamp to the end of the sheet.
Fast Colors - Fade-resistant inks.
 See also: Frame, Fugitive inks, Front, Single, Freak
  
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