Mongolia Republic. Air Mail. 1926 (3 Aug.) "Air Mail" envelope to Harbin on first flight "Verkhneudinsk - Urga" bearing Russia 1924 Air 20k. on 10r. carmine, 1925 Rebellion 3k. deep green and 7k. brown tied by good strikes of Verkhne Udinsk despatch c.d.s., the reverse with very fine strikes of Ulanbator (3.8) and Harbin (16.8) c.d.s. The envelope with three vertical creases as usual, but these were made before the adhesives applied.