If that prophetical book was written before the destruction of Jerusalem, a number of its particular allusions must most naturally be understood as referring to that city and its fall. The correct date for the writing of Revelation lies somewhere between the extremes of Claudius and Trajan.
If, however, it was written at the end of the reign of Domitian (about A. 96), as many have believed, another system of interpretation is necessary to explain the historical allusions. An interpreter who is committed to the unerring authority of God's word and to the reality of predictive prophecy must ask whether John was speaking in Revelation of the ancient city of Jerusalem, the Herodian temple, and the Roman Empire of the Caesars, 70 A. Throughout the history of the church only two general views regarding the date of Revelation have been credible and consistently forwarded.
Claudius41-54 Nero54-68 Galba68-69 (7 months) Otho69 (3 months) Vitellius69 (8 months) Vespasian69-79 Titus79-81 Domitian81-96 Nerva96-98 Trajan98-117 51.12) - Edinburgh, 19872), which dated Revelation between 50 and 54 A. These two "advantages" work against each other, however, when we remember that one of those seven Asian churches (at Ephesus) was clearly founded by Paul!
Such a view might explain why Paul was forbidden to go into Asia (Acts 16:6) - since John was already laboring there - and why Revelation 1-3 mentions only seven churches in Asia (as yet).
There is no question about the superabundance of eager prophecy popularizers in our day who jump at the "obvious" opportunity to make Revelation relevant today by choosing the second option. The difficulty with this view, even if one is not struck with the artificiality of the counting technique, is that martyrdoms can be definitely placed with the reign of Vespasian,  and the relative calm of his reign (which is out of line with the tumultuous picture in Revelation) was not marked by his pressing of claims to deity or by his persecuting of the church - both of which characterize the beast in Revelation 13. At any rate, even though I do not favor the preceding two specific interpretations of the internal evidence in Revelation, the suggestions of Galba's or Vespasian's reigns for the date of Revelation would fall within that general period which we will call "the early date" for the Book's composition.