Interpretation of Revelation has always been a thorn in the side of the WT. The trouble started with 'The Finished Mystery' (the supposed Volume 7 of Studies in the Scriptures) in 1917 that was attributed to Pastor Russell, but was really written by Clayton Woodworth and George Fisher. The book in '69 'Then is Finished the Mystery of God' was definitely a throwback to the 1917 book.
The 1980's Revelation book was one of the most preposterous books they have ever published. I still believe that the only reason they studied it in the bookstudy multiple times was to use of the inventory that they had published in advance, and found they could not place them door to door.