Full explanation? No, I don't think so. Abdul Baha' talks about a couple of chapters. Then some Baha'i wrote a book about it? And, he knows what all that stuff in Revelation means? And his book is not available online except to buy it. This is all I asked of you:
Rev13:1 The dragon stood on the shore of the sea. And I saw a beast coming out of the sea. It had ten horns and seven heads, with ten crowns on its horns, and on each head a blasphemous name.
2 The beast I saw resembled a leopard, but had feet like those of a bear and a mouth like that of a lion. The dragon gave the beast his power and his throne and great authority.
3 One of the heads of the beast seemed to have had a fatal wound, but the fatal wound had been healed. The whole world was filled with wonder and followed the beast.
4 People worshiped the dragon because he had given authority to the beast, and they also worshiped the beast
So we have a dragon and a beast. As I recall one of them the Baha'is say is the Umayyads and the other is the Abbasids. Which one is which, and did one give its power to the other?
5 The beast was given a mouth to utter proud words and blasphemies and to exercise its authority for forty-two months...
7 It was given power to wage war against God’s holy people and to conquer them. And it was given authority over every tribe, people, language and nation.
8 All inhabitants of the earth will worship the beast—all whose names have not been written in the Lamb’s book of life, the Lamb who was slain from the creation of the world.
The dragon has already had its time. This beast has authority for 42 months. Starting when and ending when? 622 to 1844? No. But Baha'is don't care. 42 months is 1260 lunar years and that's all the matters. But, who is this Lamb? One Baha'is says it is The Bab, but The Bab hasn't been born yet. But another problem, the 1st and 2nd Woes ended two chapters ago. This is in the time of the 3rd Woe. which is supposed to be about Baha'u'llah. But that's a minor problem. Now comes the good stuff.
11 Then I saw a second beast, coming out of the earth. It had two horns like a lamb, but it spoke like a dragon.
12 It exercised all the authority of the first beast on its behalf, and made the earth and its inhabitants worship the first beast, whose fatal wound had been healed.
13 And it performed great signs, even causing fire to come down from heaven to the earth in full view of the people.
14 Because of the signs it was given power to perform on behalf of the first beast, it deceived the inhabitants of the earth. It ordered them to set up an image in honor of the beast who was wounded by the sword and yet lived.
15 The second beast was given power to give breath to the image of the first beast, so that the image could speak and cause all who refused to worship the image to be killed.
16 It also forced all people, great and small, rich and poor, free and slave, to receive a mark on their right hands or on their foreheads,
17 so that they could not buy or sell unless they had the mark, which is the name of the beast or the number of its name.
18 This calls for wisdom. Let the person who has insight calculate the number of the beast, for it is the number of a man. That number is 666.
So that other beast already had power for 42 months. Now comes another beast. The other beast is the one that had a fatal wound. As I recall Baha'is say that is I believe an Umayyad leader who ruled from Andalucía. So which Islamic leader is this new one? That exercised authority on behalf of the other one? But anyway, this one sets up an image of the other beast and anyone that doesn't worship the image is to be killed. But then, this beast forces people to get a mark on their right hands or on their foreheads. They can't buy or sell without this mark. And what is this mark? It is 666. It has absolutely no relationship to the year 661AD when the first Umayyads leader took over. Unfortunately, it appears Abdul Baha is making things up. Which is fine... except Baha'is claim to have fulfilled all prophecies. Hopefully, you can show me how your interpretation of Revelation is indeed the true one.
The Baha'i explanation does not tie in very well. The 666 is not in anyway a date.