I got a few dime size coins last night. The obverse has a figure with a headband like US Liberty coins but the headband says Libertas. The coin says conf oe deratio helvetica on the obverse. The reverse simply has a wreath similar to the device on the reverse of US Indian head cents and the number 10. Most are dated 1957 to 1964. What country and are they silver? The outside edge of the rim is smooth similar to a US nickle.