The 7 seals are not given in chronological order! That's why the term 'seal' is used. There is no particular order in removing seals to a scroll in order to read the contents thereof.
The seals, chronologically, are as follow:
Listed In Time
1 ---- 6
2 ---- 3
3 ---- 4
4 ---- 2
5 ---- 1
6 ---- 7
7 ---- 5
Any eschatology, which is based upon the seals being given in chronological order, is fatally flawed.
1st Listed Seal
The key to understanding this listed seal lies in the number of the beast [Satan] being 666 in Rev. 13:18, which stands for 6th seal, 6th trumpet, and 6th vial. In reviewing the seals, one sees that Satan [Antichrist], the rider on the white horse in 6:2, is the first one listed; but, it is listed as "one of the seals" -- not the "first one". Hence, there is dispositive proof that the seals are not given in chronological order. The 1st seal is the 6th seal chronologically pursuant to Rev. 13:18, confirmed by Rev. 9:13-20 and 16:12-16.
To determine the chronological order of the other 6 seals, one simply needs to correlate them relative to the seal of Satan's appearance.
6th Listed Seal
This listed seal is the great day of the Lamb's wrath, which takes place after the seal identifying Satan's appearance [1st listed seal]. It is the 7th seal chronologically as confirmed by Rev. 11:15-19 and 16:17-21.
7th Listed Seal
This listed seal comes at the point of silence in heaven for one-half hour. In reading Rev. 17:12, the 10 kings have power given by Satan for one hour. Hence, the release of these 10 kings [Rev. 13:1] has to take place prior to this seventh listed seal. The seventh listed seal is one half hour later.
This 7th Seal marks the unleashing of the trumpets. The first 5 trumpets precede the 6th trumpet, which identifies the unveiling of Satan. Hence, the 7th seal has to take place prior to Satan's appearance [1st listed seal]. The 7th listed seal is the 5th seal chronologically.
4th Listed Seal
This listed seal marks the casting out of heaven of Satan and his fallen angels, of which some will be the 10 kings of Rev. 13:1. It marks the beginning of the hour of silence in heaven. It has to take place prior to the 7th seal [5th chronologically], as the 7th listed seal is after about one-half hour of silence in heaven. The 4th listed seal is the 2nd seal chronologically.
5th Listed Seal
This listed seal marks the plea of the martyred saints for the endtime to commence in order to avenge their executions. They are told to wait. This listed seal represents the time of teaching, including the sealing of the 144,000 in Rev. 7:3-8. The sealing of the 144,000 takes place prior to the casting out of Satan and the fallen angels [4th listed seal]. Hence, the 5th listed seal is the 1st seal in time.
3rd Listed Seal
This listed seal marks the time of the protection of God's elect. Hence, this seal would have to take place after Satan and the fallen angels have been cast out of heaven. It also represents the one-world currency in which no one is allowed to buy or sell without taking the mark of the beast.
It will take sometime after the 10 kings take control of the one-world gov't, when all economic power can be enforced. Hence, this listed seal comes after the second seal listed. The 3rd listed seal is the 4th seal chronologically.
2nd Listed Seal
This listed seal marks the beginning of world peace, which only takes place when Satan's 10 kings take power over the one-world gov't. Hence, this seal has to take place after Satan and his angels are cast out of heaven. The first order of business, by edict, from these 10 kings will be world peace. World peace logically precedes the introduction of world currency and, hence, precedes the 3rd listed seal [4th chronologically]. The 2nd listed seal is the 3rd chronologically.