Very cool. It looks like excess metal squeezed out at the corner of the window also where it goes through the ends of the logs the coloring is consistent with the logs. IMHO I'm going to say it's a very early die crack. I am an amateur and I'm sure others much more knowledgeable than me will weigh in. I'll be interested in seeing what they say.
this is a zinc coin isn't it? if that were a scratch you would be seeing the zinc. Maybe a struck through error?
Could be a case of struck through. But could be damage. I can’t make out a berm on the edges. A closer shot could help. Using my phone I’m limited.
I agree with your statement,it should've at least left a trail of the exposed zinc core. Didn't even consider that originally(my morning brain)It could be a strike through but better pictures would help.