This is a Boer War cover with an FPO Cancel 25.  What makes this one interesting is that it was used during the occupation of Lyndenburg, and is on the cover.  It was also used on GB postal Stationery.  It's dated October 19, 1901 and was sent to Battersea, London.
Ex Rich.
This item is over $100 USD so I will ship it using priority (for the states) or registered mail (for overseas).
NH=UNMOUNTED MINT, LH=LIGHT HINGE MARK, OG=MORE HINGING THAN LH, HR=GLASSINE HINGE REMAINS, NGAI=NO GUM AS ISSUED, USED=CANCELLED