The Qantas Beaver at 9:24 m in, VH-EAS was owned by Qantas from 12 January 1955 and sold 22 January 1958, so that dates the film. VH-EAS became VH-AAP and was written off in an aerial agricultural accident at Goulburn on 23 August 1958.
Also at 9:24 Rafferty says to the pilot "So long Dick". The film is not clear but I wonder in real life the pilot may have been Dick Glassy? Correction, Dick worked for ADASTRA, Ansett MAL and Air Niugini, never Qantas.