I agree with Matteproof that it is a planchet flaw, I have very similar ones for 1971 and 1975 and a couple of others not sure what years without digging them up. [same era though]
Brett, I think the right Terminology for these Error Coin's is Called ( Lamination Cracks/Flaw's ). These occur "after" the Minting Process due to the Metal Impurity's within the Planchet/Blank & it take's time to Develop into these Varity's. I have quite a few of these guy's in all Denomination's. Nice Start to your career. jpl..
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