Set of 3 tsps with rare St. Louis mark

Joseph W. Cary is cited in new book by Norman Mack--"Missouri's Silver Age." Mack says that Cary moved his jewelry store from Alton, Ill., to St. Louis ca 1870-75. These spoons have pinched-waist fiddle handles, pointed shoulders with feathered script mono E C S; length is 6-1/8", and condition is near mint, extended tips unworn.