Little help please

So this was in a hoard I won in an auction and I don't know what to think of it. It sits on my desk and I waste more brain space on it every time I see it. I don't do errors, I don't have that skill set. I tend to believe when you see something like this it is usually some weird perforation error. Please help my brain move past this. Is this a weird error or is it the product of a prior owner that cant rip a strip of 4?
1691-1694

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