Date range needed for Spanish Silver Cob coin

[gpgodwin]

I also posted in today's finds, but I dug my first Spanish Silver Cob and think its a 2 Reale from the Potusi, Peru mint. Need help determing a date range...

 

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[DCMatt]

Try posting it here for a good answer:

Spanish Cobs

 

[vpnavy]

gpgodwin has another thread (with responses) on

FORUM: Spanish Cobs - New help identifying Spanish Cob Silver coin​