Eynhallow Holy Island World Cup '74 Perforation Question

Stumbled upon these guys while sifting through. Why are the perforations doubled on 3 sides ? Thought it was pretty neat looking :)
I apologize for the poor quality image.

Nice !
I am not aware of how they were perforated, however there exist similar "shift perforations" on Australian KGV Sidefaces.

I may have read something to the effect, it may occur when the comb perforator, hits the stop pin, in the advance mechanism.

That doesn't result in extra perforations on 3 sides though.

Eyenhallow is a fairly crude "local" so I would suggest a cheap perforator, and if a "harrow" perf, may have been punctured twice.

But, speculation only.

Yes, they were Harrow Perforated.
Some show rough perfs, suggesting blunt pins
Perhaps yours were punctured twice, second out of registration /position.

Thanks for the info rod! Interesting it's on top/bottom/ (of left) and center only...how would that even happen ?

Beats me
Unless of course, they were printed in sheet form as well
(I doubt it)
Keep as EFO
Probably an hand operated perforator, no quality control in Eynhallow

With a hand operated Harrow, move the sheet 1 stamp, to the left, and re-puncture, you will 3 sides double, 1 not so.