Watchtower 1989 Jan 1 p.12
"He was laying a foundation for a work that would be completed in our 20th century." (continues
That is what the original WT said. By the time the WT volume was produced early the following year and subsequently the digital version, it had been changed to:
He was also laying a foundation for a work that would be completed in our day.
Obviously they had lost their confidence with only a decade left of the 20th Century!
George