Im no expert but Id say late 1600's and Mexico mint. Nice find
IMO, it's part of the crown on coins of Carlos III and others of that day;like this:
Don....
This should get you closer:
1/2 real (cob) Felipe II
Don....
I have read that the 1/2 cobs were added under Philip the lV (1621-1665). Don I realized you just shot me the pic. I don't see many examples of these type cobs online, I wonder why. Thank you all for your time, and help. Art