Info gleaned from various watch sites... Commissioned for Marie Antoinette by an ardent admirer in 1783, but only completed 34 years after her execution in 1827, it was the most complicated watch in the world at that time. Just one of the many amazing watches that Abraham Louis Breguet made in his lifetime. Today it still ranks in the top 5 or 10 most complicated watches in the world. When one examines the amazing watches made by Breguet, Harrison et al, one is flabbergasted at the precision with which these tiny parts are made, especially keeping in mind that this was long before CAD cam design, laser etching etc. This watch, a duplicate of the original which is in a museum in Jerusalem, is currently on display at the Breguet Boutique in Beverly Hills. See links below... http://forums.timezone.com/index.php?t=tree&goto=4688655&rid=0 http://en.wikipedia.org/wiki/Abraham_Louis_Breguet I was fortunate enough to take a few pics of this amazing timepiece this morning. And yes, the pic of the back of the watch is the automatic winding weight and mechanism, invented by Breguet.