But Slimboy, 1919 has no obvious significance to anyone apart from the GB. OK, it was predicted in the Watchtower that by 1914 they would see a paradise on Earth under Christ's heavenly rule. Like all WT predictions it was entirely wrong and in this case the very opposite happened to what was promised --world war-- but 1914 was a memorable fixture to hook ideas on.
If 1919 were to be a pivotal date it has no secular marker nor can it be linked to the Bible without devious contortions. If there were such a fantasy as "true religion" and that it began with the inheritors of Russell's teachings in 1919, then why does not everyone stick by the hallowed beliefs of that time and all enjoy the fruits of this divine outpouring? JWs most certainly don't and that would make Russellites the best candidates for the " true religion".
The year 1919 however was indeed significant for the leadership of the Bible Students; they were almost miraculously saved from bankruptcy that year. The cynic in me believes they think this was a signal from their tribal god.