Irenaeus spends a good chunk of Book V of Against Heresies discussing Revelation as yet future. In one chapter (30) he gently rebukes those who tried to make predictions on the 'name' of the beast.
Seems to me the Christian community of the time (2nd Century AD) thought fulfillment of Revelation would come in their time (sounds familiar) or yet future.
Here on number of the beast:
Against Heresies (Book V, Chapter 30)
1. Such, then, being the state of the case, and this number being found in all the most approved and ancient copies [of the Apocalypse], and those men who saw John face to face bearing their testimony [to it]; while reason also leads us to conclude that the number of the name of the beast, [if reckoned] according to the Greek mode of calculation by the [value of] the letters contained in it, will amount to six hundred and sixty and six; that is, the number of tens shall be equal to that of the hundreds, and the number of hundreds equal to that of the units (for that number which [expresses] the digit six being adhered to throughout, indicates the recapitulations of that apostasy, taken in its full extent, which occurred at the beginning, during the intermediate periods, and which shall take place at the end)—I do not know how it is that some have erred following the ordinary mode of speech, and have vitiated the middle number in the name, deducting the amount of fifty from it, so that instead of six decads they will have it that there is but one. [I am inclined to think that this occurred through the fault of the copyists, as is wont to happen, since numbers also are expressed by letters; so that the Greek letter which expresses the number sixty was easily expanded into the letter Iota of the Greeks.]
[...]
3. It is therefore more certain, and less hazardous, to await the fulfilment of the prophecy, than to be making surmises, and casting about for any names that may present themselves, inasmuch as many names can be found possessing the number mentioned; and the same question will, after all, remain unsolved. For if there are many names found possessing this number, it will be asked which among them shall the coming man bear.
Against Heresies Book 5, Ch 30
To further the view that Irenaeus, in the 2nd Century AD, did not believe Revelation was fulfilled before his time, we see in Book 5 chapter 29 the following:
Against Heresies (Book V, Chapter 29)
1. In the previous books I have set forth the causes for which God permitted these things to be made, and have pointed out that all such have been created for the benefit of that human nature which is saved, ripening for immortality that which is [possessed] of its own free will and its own power, and preparing and rendering it more adapted for eternal subjection to God. And therefore the creation is suited to [the wants of] man; for man was not made for its sake, but creation for the sake of man. Those nations however, who did not of themselves raise up their eyes unto heaven, nor returned thanks to their Maker, nor wished to behold the light of truth, but who were like blind mice concealed in the depths of ignorance, the word justly reckons "as waste water from a sink, and as the turning-weight of a balance— in fact, as nothing;" Isaiah 40:15 so far useful and serviceable to the just, as stubble conduces towards the growth of the wheat, and its straw, by means of combustion, serves for working gold. And therefore, when in the end the Church shall be suddenly caught up from this, it is said, "There shall be tribulation such as has not been since the beginning, neither shall be." [Matthew 24:21] For this is the last contest of the righteous, in which, when they overcome they are crowned with incorruption.
Against Heresies (Book V, Chapter 29)
Continuing with early Christian external writings of a post 70 AD Revelation fulfillment of tribulation and the Second Coming of Jesus Christ is the Didache (late 1st-early 2nd century AD):
Didache 16
16:1 {Be watchful} for your life; 16:2 {let your lamps not be quenched and your loins not ungirded, but be ye ready; 16:3 for ye know not the hour in which our Lord cometh.} 16:4 And ye shall gather yourselves together frequently, seeking what is fitting for your souls; 16:5 for the whole time of your faith shall not profit you, if ye be not perfected at the last season. 16:6 For in the last days {the false prophets} and corrupters shall be multiplied, and the sheep shall be turned into wolves, and love shall be turned into hate. 16:7 For as lawlessness increaseth, {they shall hate one another and shall persecute and betray. 16:8 And then} the world-deceiver {shall appear} as a son of God; 16:9 {and shall work signs and wonders,} and the earth shall be delivered into his hands; 16:10 and he shall do unholy things, which have never been since the world began. 16:11 Then all created mankind shall come to the fire of testing, and many shall be offended and perish; 16:12 {but they that endure} in their faith {shall be saved} by the Curse Himself. 16:13 {And then shall the signs} of the truth {appear;} 16:14 first a sign of a rift in the heaven, then a sign of a voice of a trumpet, and thirdly a resurrection of the dead; 16:15 yet not of all, but as it was said: 16:16 {The Lord shall come and all His saints with Him. 16:17 Then shall} the world {see the Lord coming upon the clouds of heaven.}
Two very early post apostolic writings which look to a yet future unfolding of prophetic events in the Gospels and Revelation. Completely destroys the full and partial preterist theory from early external sources.
He that hath ears to hear, let him hear.