Air Mail cover 1926 (6 May) Herschend return flight Bangkok-Copenhagen (Muller 18) envelope bearing 1915-16 2s. on 14s. block of four cancellaed by Bangkok 2 c.d.s. h.s. "BY DANISH FOKKER AEROPLANES 1926/Bangkok to Copenhagen" in top corner, signed by the pilot. Scarce as only a small amount of unofficial mail was carried. Photo