Tabanus: Hans Kmoch in Wiener Schach-Zeitung has "1. Runde, 16. Juli" for this game, but that is probably wrong:
Springfield Republican, 17 July:
"Berne, Switz., July 16 - (AP) - The international chess masters tournament began here today [...] The outstanding result <of the first round> was the defeat of Mir Sultan Khan of India by Dr. Alekhine."
Brooklyn Daily Eagle, 21 July:
"To date the world champion has defeated in consecutive sittings Mir Sultan Khan of India and Staehelin, Grob and Voellmy"
NY Evening Post, 23 July:
"The International chess tournament at Berne, Switzerland, began on Saturday, July 16, with sixteen competitors. World Champion Dr. Alexander Alekhine of France <began> auspiciously by defeating Mir Sultan Khan of India, one of the "favorites"."
Brooklyn Daily Eagle, 29 July:
"Paired with Mir Sultan Khan, the clever East Indian expert and exchampion of the British Chess Federation, <in the opening round> of the
international tournament at Bern, Dr. Alexander Alekhine, who by this time
is fairly sure of the first prize, started auspiciously by defeating the
Oriental in a Caro-Kann defense."
"In subsequent rounds Dr. Alekhine disposed ot three Swiss representatives
- Staehelin, Voellmy and Grob."
Brooklyn Daily Eagle, 4 August:
"As at Hastings, Sultan Khan was again fated to encounter Dr. Alexander Alekhine <in the first round> of the international tounament at Berne."