if you read this, this is where I am coming from.
If a blob / mark on a stamp, has a "halo" then it follows there was a foreign object between the printing plate and paper.http://goscf.com/t/51767&whichpage=104#670046
So the corollory follows, not a flaw, but an EFO
With regards "Tin Shed" I am at sixes and sevens what to believe
our member "John" uses it frequently.
As far as I know, it refers to the overall, print quality of the sideface, and not flaws, seen by the rusting of the plates.
Where EFO changes it definition, is the "spur" flaw, which is really
and EFO that lodged permanantly on the die, and formed what we know as a "flaw"
I welcome any correction to my belief, it is a toughie, but the marks on your wonderful stamp, I classify as a real EFO, and a beauty at that.
Open to sway either way.