Heraldic imperial crown of Napoleon III
Late heralic crown design of the First French Empire widespread during the Second French Empire
Drawn using File:Coat of Arms Second French Empire (1852–1870).svg 

Charles Normand, Armes et sceau de l'Empire français, Paris, 1804
Reconstructed crown of Jürgen Abeler depicted in his book "Kronen. Herrschaftszeichen der Welt. Wuppertal 1976" as reference.
of this vector depiction:David Liuzzo.