Indeed.....the Book of Rev. ID's just whom that book was written to and where the information delivered came from.
This Book was written by "John". The source of the Book is the Christ Himself. The words were given to an angel who gave them to John. John drafted the words given to him. (Rev. 1:1, 4, 9 and 22:8).
The Book of Rev. even reveals just when the Book was written. It was written in the 1st century around 68AD during the Roman Reign of Nero. How do we know this? The Book reveals that hostile action by Rome was becoming severe against Christians. (Rev. 1:9) John was imprisoned on the Isle of Patmos. (Rev. 2:10) This passage declares "Things that you will shortly suffer". Shortly not some distant time in the future but SHORTLY. Then the Book directly mentioned another Christian who was executed by Rome in that time period, "Antipas". https://en.wikipedia.org/wiki/Antipas_of_Pergamum
The revelations in the Book where to "shortly take place." -- Rev. 1:1,3,22:6,10. Thus, any view or attempt at "interpretation" that does not take into account the actual writings that state when these revelations are to take place as being in the 1st century are contradicting the scriptures.
This does not mean that all the revealed information was to take place in the 1st or early 2nd century as there are specific and unambiguous texts that talk about the 2nd coming of the Christ. But the information to the 7 Churches was indeed speaking of that time period in which the Book was first written. Rev. 1:4 states that the Book was written to the 7 churches found in Asia Minor at that time period. Chapters 2 and 3 give the names of these Churches that have been historically proven to exist during that period. Why just mention 7 churches in that region when more clearly existed. The Book of Revelation also clearly states the information being delivered was symbolic (Rev. 1:1)...the word SIGNIFIED means symbolic, the way information can be interpreted.
7 in the Judeo/Christian philosophy is described as THE PERFECT NUMBER....thus, the 7 churches were the perfect symbolism to rightly interpret the things that were SIGNIFIED/symbolic.
John also mentions 7 spirits. A clear reference to another part of the Bible (Zech. 4:10) which mentions the 7 eyes of the Lord.....all seeing, all knowing.
John borrowed Revelation from an earlier Jewish apocryphal writing.
http://historical-jesus.info/rjohn.html