This type was designed by Adolph A. Weimann, whose monogram, AW, appears under the tips of the tail feathers. On the 1916 coins and some of the 1917 coins the mint mark is located on the obverse below the motto. 
Weight 12.50 grams; composition .900 silver, .100 copper (net weight: .36169 oz. pure silver); diameter 30.6 mm; reeded edge; mints: Philadelphia, Denver, San Francisco.