Almost Uncirculated Spain Cob type Philip III silver 1 real coin.
Minted at Seville (S mintmark, Assayer B).
For cob types it is rare to encounter high grade, decently centered examples with a sharp date.
Mintmark & assayer letter to left of shield.
Certified by NGC to AU 53, Population Census: This coin, none higher.
Coinage type used in American colonies.