Hi Nooassei -
It was Philazilla that pointed out the reperf at the top. To be honest, I did not see it as that, but struck as odd that the at edge look so clean cut. Even with saturated gum on the perf edges on the other sides, you can see paper fibers from where the stamp was originally separated from the sheet. Not so on the top edge - very clean:

I have made a habit of doing high resolution scans on all stamps when received and keeping on record. I did not notice any of this until I did the scan.
RedwoodRandy - Fake cert would be a bonus!
I gotta say, thanks to this forum, I am learning a lot... and it is entertaining.
Thanks,
Ken