Three letters on paper, and one card, mss. holograph, sent by balloon post from Paris to London during the Siege of Paris 1870-1871. Each letter folded to c6x12cm. Sent 30 Sept 70 ; 18 Oct 70; 22 Nov 70; 3 Jan 71; franked from Place De La Bourse, also stamped Lille-Calais. Stamps, wax seals, various other frankings, Par Ballon Monte. With: postcard 10x14.5cm commemorating the 75th anniversary in 1946 of the Paris Balloon Post, one side engraved by Hertenberger with 'Le General Cambronne' pilot Tristan's last post 28.1.1871, Gare de l'Est, reverse with stamp portrait of Leon Gambetta and frankings for the anniversary 27 Janvier 1946