Air Mail cover -- 1923 (July) Vladivostock - Spassk flight 20k. on 35a. on 2k. [1], affixed to original XU5 (part of reverse missing) and cancelled by (28.7) c.d.s., carried on the (29.7) flight and kept by the Spassk P.O. until September 5th; ink notations on face "By Airmail" and "received 7/VIII 11 hour 45 min". Very rare. Mikulski Certificate (1993). M.58. Photo.