Hello everyone, I was going through one of the stamp binders I have and noticed a line of scott 564 stamps. Nothing out of the ordinary, but this stamp in particular has a 6.3 perf at the top. This does not seem to be the actual top of the single stamp, rather the bottom part of another stamp. Everything is connected, and the cancel mark is consistent.
I hope to gain some understanding on this topic, whether it be a process I didn't know or the idea that this is a rare stamp.
Any ideas will be a big help.