This First Day Cover was issued on April 16, 1999 to celebrate 70 years of Monaco Grand Prix racing.
It is rather special as the cover itself celebrates 50 years of Prince Rainier's reign, comes the 70 years Monaco GP stamp which shows an impression of the first ever winner of the GP, "Williams" on Bugatti and the person who was expected the be the winner of the 1999 event, Michael Schumacher on Ferrari coming out of the tunnel side by side.
The stamp has been canceled with the First Day Issue cancellation which shows a map of the race track and the date: 16 - 4 - 1999 PLUS a special cancellation of the race day, May 1999.
Very rare to find this combination !
Only a few are still available.