The January 1, 1989 Watchtower magazine, page 12 (printed BEFORE the bound volume edition), it said that the apostle Paul was spearheading the Christian missionary activity. "He was also laying a foundation for a work that would be completed in our 20th century."
However, in the bound volume for the 1989 Watchtower magazines and on the Watchtower Library CD-ROM, this was changed to say "He was also laying a foundation for a work that would be completed in our day." This was clearly a prophecy but it got changed.
Petra!