It's hard to tell if the zinc is showing by the doubling but if it is, IMO I would think possibly split plate doubling.
Hopefully the black death doesn't start showing. Maybe it will just stay this way after its sealed up.
I can't seem to find any other strikes like this on the web and I haven't come across another like this that I can remember. I wouldn't normally card something like this but I can't stop looking at it.