For what it is worth...
Everyone here seems to be pointing towards 'old'...
Only you know the conditions in which you found it, and i will not venture a guess on how it came to be there.
Just keep in mind that these are still made today.
Seemingly every single tourist trap 'rustic art' business here in the Texas Hill Country has these same identical stars - with flash rust present - in bins/buckets of all different sizes for people to use to tack to their rustic furniture, outdoor structures, etc.
A lot of these hack 'rustic fabricators' use them for lamps, hat racks, paper towel holders, etc, too.