Mold Injection hole
Im.no expert but learning. The mold injection hole was moved outward starting with the little ic stamp I think and probably continued through the 73 version but im.no expert just guessing. Here is a puc of a little ic stamp that's also found on 70-72. Then a 73. The mold injection hole is not in same place as mine but the big ic wheel is. Like I said they did have blanks in 70. Mine is proof.
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