There are two important aspects to the 1975 lie both originating from the bible.
The first and the most obvious is nowhere is it mentioned in the bible that god's day of judgment will come after
6000 years or symbolic Days of mankind's existence from Adam .
It does say though that no one will know the time not even the son, therefore making up any calculable dating system is basically unscriptural.
Therefore 6000 years has no relevancy to the topic in relation to when Armageddon should appear.
And secondly there is no real solidly accurate way to calculate 6000 years back to Adam's existence and end up at the fall of 1975,
this professed doctrine alone makes most bible scholars laugh with justifiable ridicule.
1975 for the WTS. was a marketing scheme to infuse the suggestion that god's day of judgment upon mankind was to happen soon
and all were advise to heed this proclamation. Unfortunately the marketing scheme did work, the WTS sold more of their pieces of literature
worldwide, more people became proselyting JWS and perhaps more money was cultivated as well from all of this activity.
The WTS. came out clear winners for a time, well at least up to and shortly past 1975, the following years weren't so good
since people started to realize what they were up to.
I think Terry makes a valid point though, the only thing that might compare in the numbers in publications would have to be the bible itself,
there's a whole bunch of lies in that book to be duly recognized.