When did the Watchtower first raise the idea of 1919?

jwfacts

It was in the August 15, 1919 issue of the Watchtower where the antitype of Elijah-Elisha was reinterpreted.
Rutherford had 9 months holed up in prision to start developing his new spin of Russell's religion.
Terry

Pastor Russell who was secretly seen as faithful and wise servant.
There was nothing 'secret' about it, Terry. The early/mid-1920s Watchtowers shouted it out loud and clear.
My timeframe was intended as during Russell's lifetime. Thanks for clarifying that.
Ding

Most JWs today have no idea that Rutherford claimed there were all sorts of types and "classes" in the Bible.
It was new light whenever he added one.
Then that become old light and the new light is that those classes never really existed at all.
I guess the light just keeps getting brighter and brighter flashing on and off.