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This series came into being as the result of one of the worst tragedies of the 20th century. In the first year the coin was struck in 90% silver, but the following year the composition was changed to an 80% silver outer core bonded to a 21% silver inner core. This silver “sandwich” continued through 1970, then was changed to copper-nickel, eliminating the silver content completely. A reverse showing Independence Hall was used during the bicentennial.