The Delaware Tercentenary half dollar (also known as the Swedish Delaware half dollar) is a commemorative fifty-cent piece struck by the United States Bureau of the Mint to commemorate the 300th anniversary of the first successful European settlement in Delaware. The obverse features the Swedish ship Kalmar Nyckel, which brought early settlers to Delaware, and the reverse depicts Old Swedes Church, claimed to be the oldest Protestant church in the United States still in use as a place of worship. While the coins are dated "1936" on the obverse and the reverse also has the dual date of "1638" and "1938", the coins were actually struck in 1937.