In 1914, Austrian watchmaker Georg Grabner created the Kolibri -- the "Hummingbird" pistol. The smallest autoloading pistol ever made, it fires a .11 caliber bullet. He marketed it as a self-defense firearm for women to carry in their purses. More pictures and history at the link.
http://www.hellinahandbasket.net/2007/01/float-like-a-hummingbird-sting.htm