Odd that there is an inch or so of fairly bare metal between the head of the bolt and the threads... leads one to believe that whatever it was for, it was for holding something together at least that thick. And it is pretty clean... The frame is all welded right??? Wonder if its just an extra bolt some assembler accidently dropped from his wrench and couldn't retrieve so grabbed another one... and that loose bolt didn't shake free until your driveway.
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