I've watched the film and can see the numbers going up to 7000 on the front of the podium.
What am l missing?
Good question. As I recall, they were still teaching the chronology that 6000 years of man's existence, that is from the creation of Adam, was to end in 1975. The gentile times would end and usher in the next 1000 years (hence the '7000' on the platform) would be the Millenial reign. After that a perfect existence of eternity. The 7000 was the 7th creative day, and jived with the belief that each of the creative days was 7000 years long. All preposterous of course, but that is the chronology they inherited from the Russell days and still taught into the '70s.