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Designers Dilroy Roberts and Frank Gasparro. Standards for 1964: weight 12.50 grams; composition: .900 silver, .100 copper. 1965-1970: weight 11.50 grams; composition: outer layers of .800 silver, .200 copper bonded to inner core of .209 silver, .791 copper; 1971 to present: weight 11.34 grams; composition: outer layers of copper-nickel (.750 copper, .250 nickel) bonded to inner core of pure copper; diameter 30.6 mm; reeded edge. Net weight: 1964 .36169 oz. pure silver. 1965-1970 .1479 oz. pure silver, mints: Philadelphia, Denver, San Francisco.
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