Quarter and half quarter hour repeater with ruby cylinder escapement no. 255.
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Large display watch with cylinder escapement and dead central seconds.
Central seconds, regulateur dial, cylinder escapement
Josiah Emery Straight Lever Escapement Chronometer.
Cylinder escapement watch formerly belonging to Louis Bonaparte (1778–1846), brother of Napoleon, King of Holland, and passed down within the Imperial dynasty.
Watch presented by Napoleon Bonaparte to Jean Joseph Gauthier on 21 Floréal Year VII (May 10, 1799), verge escapement
Monthly and week calendar, with central seconds, verge escapement.
“In homage to A.L. Breguet”, chronometer with thermometer, weekly calendar and power reserve.
Alarm with verge escapement
Dual scale thermometer on the Houriet principle
Chronometer with patented detent escapement.
Duplex double wheel escapement, monthly republican calendar.
Small sized watch, cylinder escapement, enamelled case
Lever escapement and thermal compensation
Movement with lever detent escapement invented by Robert Robin
Revolutionary and Gregorian calendar, "virgule" escapement.