However, you seam to miss the point here. It was the watchtower, and not the JWs that put this thought into the minds of JWs at that time in history.
WT never said outright that "the end" would come in 1975 but the literature and thinking circa 1975 implied that if it did it, the event would converge with Bible chronology; but the wt also concurrently published in the ASI book that the time of creation of Eve and the end of 6th Creative day was an unknown variable that was a factor affecting any conclusions about 1975.- Fisherman
My statement is supported by the talk linked by Blondie . Listen to it. The speaker says "possibly" in reference to 1975.