Margaret Thatcher Signed 1987 General Election First Day CoverA First Day Cover marking the 1987 General Election, signed in blue felt tip by former British Prime Minister Margaret Thatcher. Postmarked London, 11 June 1987. In fine condition. The 1987 General Election saw Thatcher become the first Prime Minister in more than 150 years to win a third consecutive term in office, as the Conservatives claimed victory over Labour with a majority of 102 seats. A nice piece of political postal history, featuring a