Swedish copper coin from 1634 , one face features the shield and crown of Christina with the date.  The other coin face features three crowns with the initials CRS meaning Christina Regina Sveciae or Queen Christina of Sweden.  The coin itself is 30mm and pressure set in sterling silver. 32" of brass and sterling silver chain connected with turquoise and malachite. 

Queen Christina (b.1626-1689) (reign 1632-54) was one of the most unusual monarchs in European history.  She inherited the throne at age 6 from her father killed at war.  She was reared by brilliant tutors and advised to rule in a complex and dangerous polital world.  Christina was called the Minerva of the North for her intellect and devotion to study, her motto: "Wisdom is the nation's support."