Lot 873, Canada 1929 first flight cover Montreal to Santiago Chile

Lot 873 Canada 1929 First Flight to Santiago Chile, mailed in Montreal on July 11, 1929, trough Cristobal Canal Zone (machine cancel dated JUL.15 on back) and arrived JUL.29 (c.d.s. receiver on back). The cover is franked with a 50c Bluenose, a 20c Admiral and a 5c airmail. Rsv. Estimate C$200.