From an egg collector!
With the little stand (it's attached) the entire piece is about 5"
tall. The egg has a big "N" painted on the side opposite of the portrait
of Napoleon. The egg inside the egg shaped "cage" appears to be
made out of wood and does come out of the cage.
(It has a small hole in it and rests on a small spike.)
It was purchased about 50 years ago from an antiques dealer in NYC.
If anyone has any information about this I am sure the collector would be thrilled! Leave a comment if you do!