KM# 840 THALER0.8330 Silver Ruler: Ferdinand III Obv: Laureate bust with lacecollar right Rev: With flat-topped shield on breast Mint: ViennaNote: Dav. #3174. Varieties exist. Prev. KM#1826. Austria Holy Roman Empire 1637 1638 1640 1641 1643 1644 1646 1647 1648 1649