The Watchtower 12/1/1973 had this article "Jehovah Brings ‘Sealing’ of His Chosen Ones to a Close" in which they implied that there would not be a general increase in anointed ones and that the sealing of those already chosen was drawing near. "Surely" this was because the final hour of 1975 was around the corner.
"Evidently" they have had a flip flop again and it is "likely" that they don't know anymore than they did in 1973.