Seems to have been Struck Through Grease, which is kinda neat. I do see some areas of corrosion on the reverse where the zinc core has been exposed to the elements and is in the process of degrading. Keep it if you want until you get your hands on an even more extreme example.
"If you climb a good tree, you get a push." -----Ghanaian proverb
"The danger we all now face is distinguishing between what is authentic and what is performed." -----King Adz
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