1881 "To our understanding the general call to this joint heirship with our Redeemer as members of the New Creation of God, ceased in 1881." Studies In the Scriptures Series VI - New Creation 1915 ed. p.95 "To our understanding the general call to this joint heirship with our Redeemer as members of the New Creation of God, ceased in 1881." Studies In the Scriptures Series VI - New Creation 1915 ed. p.95 https://www.jwfacts.com/watchtower/1800s.php
A noteworthy example is the date for the sealing of the 144,000, a date constantly changed. Russell originally set it as being 1878. This was moved to 1881, 1910, 1914, 1925, 1931 and finally 1935. In 2007 it has admitted as unknown.
The dates above and their meaning as it evolved can be found at www.jwfacts.com
Russell had said that all 144,000 had been chosen by 1881 and presented a number of Biblical reasons why this was the case.
"Remember, too, that the Scriptures proved to us in various ways-by the Jubilee Cycles, the 1335 days of Daniel, the Parallel Dispensations, etc.-that the "harvest" or end of this age was due to begin in October, 1874, and that the Great Reaper was then due to be present; that seven years later-in October, 1881-the "high calling" ceased, though some will be admitted to the same favors afterward, without a general call being made, to fill the places of some of the called ones who, on being tested, will be found unworthy." Thy Kingdom Come p.362