i don't believe it is a physical object. Seat of Satan means any throne, well according to this, but maybe someone else knows more about an actual
object with that name.
Re 2:12 ¶ And to the angel of the church in Pergamos write; These things saith he which hath the sharp sword with two edges;
13 I know thy works, and where thou dwellest, even where Satan's seat is: and thou holdest fast my name, and hast not denied my faith, even in those
days wherein Antipas was my faithful martyr, who was slain among you, where Satan dwelleth.
"The word "Pergamos" means ‘much marriage’."
"This church is said to dwell where Satan dwells. An interesting side note, historically, is that the high Babylonian mystical priesthood, which
taught the religion of Semiramis, Tammuz, and Nimrod – teaching of the virgin-born Tammuz, who had the sign of the cross, born on December 25
(Christ-mass) with the holy, mistletoe, yule log, rings, beads, Easter bunnies, candles, etc. – was moved from Babylon to Pergamos in 133 B.C. This
mystical Babylonian priesthood is found in Pergamos at the time of the writing of John’s Book of Revelation, and yet it pictures the subsequent
removal of this high Babylonian priesthood to Rome itself, in 313 A.D."
"At the council of Nicea, when Constantine integrated the Christian Church with the World, and brought the church and state together (as you find it
in the Vatican today), he took up the mystical Babylonian religion, which is found exposed in the Old Testament. If there is any doubt about this
religion, we will find out when we get to Revelation 2:20 that this religion of black-robed priests, called "father," is as old as 1800 B.C.! It is
no more "Christian" than a burlesque show."
"This group dwells where Satan has a seat. He speaks out of the seat – ex-cathedra – out of the chair." (just like the popes will later in history)
"The Pergamos group of Christians was living earlier under pagan Rome, and now they came under papal Rome. (The Vatican has killed more than ten
times as many Christians than pagan Rome ever thought of doing.) "