To show just how rapidly the dates wore from 1916-24 Standing Liberty Quarters, a useful source is a 1938 survey of 5,000 circulating quarters made by Dr. J. Robert Schneider and published in the Numismatic Scrapbook Magazine. It reveals that of 1520 pre-1925 Standing Liberties examined, all but 58 were dateless! This was just 22 years after the type had been introduced.