This is a 1953 First Day Cover of Queen Elizbeth’s Coronation.  It was canceled in London F.S. (Foreign Section), June 3, 1953, the day of the coronation with the official cancellation of a “Crown” and “Long Live the Queen” on the stamps and mailed to Australia.  The Cachet is of the Crown with "Coronation, Ellizabeth R. 1958" circled around it.  The cover was published by "Quantas, Australia's International Airlines".  The reverse has a "Sydney" received cancellation.

   The envelope has some minor damage to the corners, but the envelope is overall in good condition with a clean and clear cachet and cancel.