The VDB initials on the obverse are almost non existent. The F of the designers initials on the reverse is gone. Might have been obstructed by a cloth? Any chance this happened at the mint?
Even though this coin was minted 2 years prior to the release of the movie 'E.T.', it looks like our extra-terrestrial friend got his finger caught in the press - with a slow, monotone "ouch". Glad the little grey dude didn't pick up too much copper here. Otherwise his finger would have had a more bluish-green glow in the movie.
Seriously though, as others mentioned, it does look like evidence of glue. It appears that there is excessive corrosion outlining the areas where the glue had contacted the coin. My guess is the reaction of cyanoacrylate (Krazy glue) with oxygen &/or UV accelerated the copper corrosion at the outline of the areas where the glue used to be.
I would have this coin checked out a little further. It looks like a strike through with glue but photos can be deceiving.
I’m imagining a big ol’ dollop of glue that used to be on the coin and was likely removed with a solvent. To me, it looks like there’s little to none of it left on the surface of the coin (because the toning is relatively similar throughout the surface of the coin). Again, it’s just my opinion.
This had a long bath in acetone. The strange shape is incused not raised. If glue, would it have carved out that strange shape on the surface?
Possibly a wire attached to an electrical source and then glued to the surface? Anyway, the overwhelming consensus this did not happen at the mint. Thank you all for your responses.
IMO, it looks like the incused line is a result of accelerated corrosion at the contact point of the glue to the coin. Acceleration is likely due to one or more components of the glue reacting with oxygen &/or UV light. The glue apparently protected the rest of surface of the coin where it had made contact. The corrosion-inducing chemical(s) likely migrated to the surface of the glue and concentrated at the outline.