Task: Question Generation
Input (English): Context : The Webley Revolver (also known as the Webley Top-Break Revolver or Webley Self-Extracting Revolver) was, in various marks, the standard issue service pistol for the armed forces of the United Kingdom, the British Empire, and the Commonwealth from 1887 until 1963. 
Answer : 1887
Output (English): Which was the official year for the approval of Webley Revolver?