maybe a magnet test is in order . window weights are cast iron here , are they lead in FLA?Bent lead...
op stated "The metal seems a little soft and rubs off on your fingers."
So ?
I have never dug one either... i have just seen a few in window mounts.I haven't dug any lead ones here in Florida, not to say they didn't make them. But all the trash pits and old home sites i have found them in have been iron and not curved....and usually a tad bigger than the OPs exampe
Bent from mower / tractor ?I have never dug one either... i have just seen a few in window mounts.
The Ops item may very well be iron.
VERIFY THIS WITH A XRAY FLOROSCOPY SCAN: