Kinda looks like the mast thing. Yeah we can see it clearly now. And it looks raised. Think mint damaged. Might be an only one in the universe. @Rick Stachowski. Think this member might shine some light on it.
So is this coin struck through or a die gouge? I don't doubt either scenario but I am a little confused and just want to be sure of what to look for. You are saying a piece of dried glue fell onto the planchet before the strike but the OP says the line is raised.
Yes, struck through is common. If you can get it to the right collector, you might be able to get couple dollars for it.
"Very interesting". Wish I could remember the movie or TV show that quote is from with a Dracula like accent.