If you want to pay by check, money order or cashier's check, please click here to order. Country Area Year mint denomination condition silver/gold quantity cat number sell each information Cart AUSTRALIA 20 cents 1966   20 cents proof   1 66 $12.00 duckbill platypus AUSTRALIA 20 cents 1970   20 cents xf   1 66 $1.00 duckbill platypus AUSTRALIA 20 cents 1972   20 cents unc   1 66 $8.00 duckbill platypus AUSTRALIA 20 cents 1974   20 cents unc   1 66 $8.50 duckbill platypus AUSTRALIA 20 cents 1976   20 cents proof   1 66 $3.75 duckbill platypus If you want to pay by check, money order or cashier's check, please click here to order.