THE MORNING POST & DAILY ADVERTISER, London, February 21, 1792  Page 3 has a brief report "La Chevaliere D'Eon's collection of Vauban's manuscripts has been sold for the insufficient price of 500l."  d'Eon was a French diplomat, spy, freemason and soldier whose sex had been questioned from time to time.
Complete in four pages, measuring 12 1/2 by 18 inches with an archival mend on pages two and three, otherwise in nice condition. A nearly complete red ink tax stamp is on the front page.