⅔ Thaler - Henry of Saxe-Weissenfels

Barby was among the smallest sovereign territories in the Holy Roman Empire, and its coinage output was extraordinarily limited. This ⅔ Thaler — the denomination that briefly dominated northern German trade in the 1680s as a response to the debased coinage flooding markets from lesser mints — is catalogued under a single KM number, suggesting it may represent the entirety of the county's silver coinage under Henry's administration.

Henry Julius of Saxe-Weissenfels held Barby through the complex Ernestine inheritance arrangements that scattered Saxon authority across dozens of micro-territories. The county was absorbed into Magdeburg after the line extinguished.