@em, first welcome to CCF. Second, yes I agree that with those nice rims, it appears as though much of the obv die was clogged with grease when this was struck (as opposed to being damage or odd wear).
"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