I think this type of a flaw is called a "Hickie" variety. It is usually caused by dirt or some kind of foreign material on the plate when the stamps were being printed.
I have a few Canadian stamps with this type of flaw.
Yes, I think it is a donut/hickie/dirt/etc. It is surely not a constant, though I thought it was interesting and in a good location to get a mention. Those donuts out in the middle of nowhere are also common, but not as much fun.
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Posted 03/11/2015 12:22 am
