I believe....
1.
7-Candlesticks - Seven church congregations - Messianic, Martyr, Orthodox, Catholic, Protestant, Wesleyan, Charismatic.
2.
7-Stars - All the Christians in the above congregation
3.
7-Seals- The book is the
Lambs Book of Life where all the saved have their names entered. The Seven Seals seal each congregation.
If this is not the
Lambs Book of Life why all the ado?
And I saw in the right hand of him that sat on the throne a book written within and on the backside, sealed with seven seals. And I saw a strong angel proclaiming with a loud voice, Who is worthy to open the book, and to loose the seals thereof? And no man in heaven, nor in earth, neither under the earth, was able to open the book, neither to look thereon. And I wept much, because no man was found worthy to open and to read the book, neither to look thereon. - Revelation 5:1-4
Christ Jesus was worthy to open the book! His sacrifice was approved of God the Father therefore all the Saints can enter heaven. Which warrants much joy, singing, and ado.
And they sung a new song, saying, Thou art worthy to take the book, and to open the seals thereof: for thou wast slain, and hast redeemed us to God by thy blood out of every kindred, and tongue, and people, and nation; - Revelation 5:9