CANADA 1921, Canada: Newfoundland: Airmails: 1921 Botwood, Newfoundland–Halifax, Nova Scotia, ''AIR MAIL/to Halifax, N.S./1921'' on 35c., 23/4mm. between ''AIR'' and ''MAIL'', no stop and ''1'' of ''1921'' below ''f'' of ''Halifax'', used with St. Johns Nov. 22 1921 machine cancellation on cover, the mail delivered by sea due to the crash of the plane, Halifax Feb. 4 1922 machine slogan arrival on reverse. S.G. 148b. Photo.

Thailand 1928 (Oct. 2) Flight  cover to London  signed by the pilots John Lee and Stephen Smith.  scarce and good condition.
Thailand 1928 airmail cover from Bangkok to London England bearing 1928 King Prajadhipok stamps 10 satang & 25 satang (Scott 214 & 217 ; Michel No. 202 &  204 ;  SG  255, 257) tied by  a special cachet of two airplane silhouettes trailed by three wavy lines, in violet, which was used only in the autumn of 1928. The VIA AIRMAIL MARSEILLES-LONDON cachet in black was applied by the Bangkok G.P.O. Stephen Smith autograph on back along with his handwritten note : " only 35 covers carried on flight" Very scarce and good condition.C.J. Chan was a stamp dealer who prepared covers for many early Siam inland air mail flights.  On October 2, 1928, mail left Bangkok on the inauguration of Bangkok-Marseilles, France-London, England service.  The mail was flown over the Marseilles-London leg of the route.  Fawdry reports that there were only about 35 covers carried on this air mail first flight, the small number probably due to the fact that the public did not feel justified in paying additional postage for the savings of half a day of transit time.  The majority of these covers were prepared by Chan. 

1928 Thailand registered postal card for Experimental flight, signed by Stephen Smith. Rare postal history.