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Miniature Wheellock pistol, possibly by Michel Mann, Nuremberg, late 16th century

Wheel Lock  from About.com, with an animated demonstration of the mechanism.

Firearms from the collections of the Prince of Liechtenstein, an exhibition catalog from The Metropolitan Museum of Art (fully available online as PDF), which contains material on wheellocks

16th Century German Wheellock Pistol with Extensive Scrimshaw Inlays, Dated 1596, Images and more description. It has the marks of Baltwarar Dressler.