
The black felted beaver fur "bicorne" hat is one of only 19 examples left of the French emperor's unusual headwear, and was sold by Monaco's Grimaldi family.
It was auctioned off for almost five times its estimated value of between 300,000 and 400,000 euros.
During his reign as French emperor -- from 1804-1814 and again in 1815 -- Napoleon Bonaparte is said to have worn around 120 of the hats. ?AFP