Austria, Maria Theresa (1740-1780) AR Thaler (Silver, 41mm, 27.99g) Milan, 1780. Obv: M. THERESIA·D·G· / R·IMP·HU·BO·REG·/ S·F, bust right Rev: ARCHID. AVST. DUX - BURG. CO. TYR. 1780 .X, crowned eagle. Ref: Hafner 39a.