@jenn, first welcome to CCF. Second, the surface staining is a bit distracting, but I agree that the reason for the missing number 2 in the date is most likely due to this coin being struck from a grease-filled die. That is a fun find.
"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