The following events occurred in April 1971: April 1, 1971 (Thursday) The United Kingdom lifted all restrictions on gold ownership with the Exchange Control (Gold Coins Exemption) Order 1971. The postal code used in Canada was started with a test in Ottawa, with plans to introduce it in Manitoba in the autumn, Saskatchewan in the spring of 1972, and other provinces between 1972 and 1974. The day after U.S. Army Second Lieutenant William Calley was sentenced to life in prison in his court-martial for 22 murders, he was transferred from prison to house arrest by order of U.S. President Richard M. Nixon. An attempted coup d'etat in Ecuador ended only hours after it started, without any violence. The night before, Army General Luis Jacome Chavez and about 50 Ecuadorian War Academy officers several disgruntled soldiers announced that they were commencing a revolt against President José Velasco Ibarra and his nephew, Defense Minister Jorge Acosta Velasco. Acosta's assistant announced on Thursday morning that Jacome had surrendered. The city of Bizen was founded in the Okayama Prefecture of Japan. As of 2017, it had a population of almost 36,000 people. Born: Danielle Smith, Canadian politician, Premier of Alberta, in Calgary Jessica Collins, American TV actress, as Jennifer Lynn Campogna in Schenectady, New York April 2, 1971 (Friday) The Tripoli Agreement was signed in the Libyan city of Tripoli by representatives of oil companies from around the world and by oil ministers of OPEC (the Organization of the Petroleum Exporting Countries), providing for higher prices to be paid to OPEC nations for petroleum until 1976. The cult classic U.S. TV soap opera Dark Shadows broadcast its 1,226th and final episode. Born: Todd Woodbridge, Australian professional tennis player and half of the Grand Slam doubles winning team of Woodbridge and Woodforde (11 titles), and Woodbridge and Bjorkman (5 titles); in Sydney April 3, 1971 (Saturday) Tajuddin Ahmad, the General Secretary of the Awami League and a leader of the independence movement for the Bengali population of East Pakistan, met with India's Prime Minister Indira Gandhi to seek Indian aid in the fight for Bangladesh's liberation from Pakistan. Un banc, un arbre, une rue, sung by Séverine (music by Jean-Pierre Bourtayre, lyrics by Yves Dessca), won the Eurovision Song Contest 1971 for Monaco. Born: Picabo Street, American skier and celebrity, 1998 Olympic gold medalist; in Triumph, Idaho Died: Jacques Ochs, 88, Belgian artist and Olympic