@1369, first welcome to CCF. Second, If you are looking for guesses on the date, mine is 1941. It is hard to tell for sure with this level of damage from circulation.
"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
It appears to be environmental damage. But it's so bad that I'd clean it. That can't hurt it anymore than it has been. Of course it would end up as a space filler.
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