I would call it - Blind perforation - intended performations that are only lightly impressed by the perforating pins, often the product of a badly adjusted perforating machine or worn or missing pins or misaligned stamp sheets
I've posted this on another forum, but have received no responses. So I'll show it here too and compare notes.
I was looking over some Nova Scotias last night. I have what I think is a rather nice MNH #8. I noticed, looking at the back a row of bumps running top to bottom.
Don't think it is a stitch watermark. Any images I've seen of those show a row of lines. These are circles, and pretty well correspond to the perforations nearby.
Someone started running it through the perfing machine and changed their mind?
See what you think.
re: Nova Scotia #8 with misperfs - almost
I would call it - Blind perforation - intended performations that are only lightly impressed by the perforating pins, often the product of a badly adjusted perforating machine or worn or missing pins or misaligned stamp sheets