Hi Dana
I take it that you are sure that this bronze piece was excavated in Florida.
Judging by its forms and patina, i woud presume it is way (extremely?) older than the Spanish arrival in America. Bolts from the 14-16th century didn't have such smooth (harmoneous) lines and were usualy made of iron ... and would hardly have such fantastic patina.
If it weren't for the Florida provenance, i would within my ignorance guess that this would be an object of the bronze age ... you know, the (so often faked) Luristan type of stuff.
But i am just playing the smart
.