Isaac, the Society can't really keep it's story straight. The Proclaimers book claims that 1914 became solid JW doctrine from 1925, but this is contradicted by Society literature from 1929 which explicitly says Christ's Presence began in 1874. So the Proclaimers date is not accurate. And the 1973 book "God's Kingdom of a Thousand Years" indicates that 1914 didn't become solidly accepted as the year of Christ's presence until 1943! I can find actual references if you need them.
IMO, It's probably safe to say that the Society actively taught that Christ "Presence" began in 1874 until 1929, and didn't fully repeal this teaching until 1943.