This 1996 Reign of King Edward VIII medal cover is a Benham first day cover.
It commemorates the 325 days reign of King Edward VIII and features a Fantasy Crown/Medal from Mauritius and multiple Royal Mail stamps.
Cancelled postmark 60th Anniversary the Accession of King Edward VIII Sandringham 20th January 1996.
The 1936 Crown in this cover (X#M5 or X#M5a
) is one of several fantasy coins minted using the effigy of Edward VIII from different nations of the Commonwealth.
This appears to be from the Richard Lobel series.
Please see images of the PNC for a personal inspection as this is the actual item available.