AIR SURVEY COMPANY - FIRST FLIGHT:16 July 1926 O.H.M.S. env without adhesives to "The Principal Medical Officer", Kuching with large "SIBU" c.d.s. of Sibu for 16/July /1926 and 18 July 1926 the later (flight day) cancelling m/s "Per/Air/Mail" in the hand of E W Jacques the Sibu postmaster. At lower left typed "D.M.O." (? deputy medical officer) with initials above. 70 items flown but very few were official mail.