not issued: 15 franc for the Air Force, imperforated miniature sheets with 50 franc airplanes (Michel number XVIII) on the back, without gum as produced, sound, unsigned, photo expertize Brunel VP (2026) "the condition is perfect. the miniature sheet with on both sides printing is rare. ", by Michel not listed (7 % import duty will be charged on the hammer price, if this lots is shipped within the EC or the UK).