Sound teachers have promoted the idea that the seven Churches in Revelation, while being literal, have also applied to seven portions of Church history. This seems to be fairly commonly held, because various people will refer to the present age as "Laodicean". This is probably one of the few areas where both full futurists and many historicists agree in their interpretations on the book of Revelation.

The Philadelphia age was the time when the KJB went everywhere in power. It was the time when the Pure Cambridge Edition came to pass. Despite the rise of secularism, evolution, modernism, cults, ecumenism, communism, nazism, modern versions and so forth, the Philadelphia age remains the time of the greatest material increase of the Bible. You know very well the might of Queen Victoria's empire. But if you do not hold the KJB to be anything special...