Almost identical watch No. 2835, is illustrated and described by George Daniels in The Art of Breguet, page 230, fig. 251 a-c, it was sold by Antiquorum on 14 April 1991 in the sale "The Art of Breguet", lot No. 34. Both supremely elegant and technically brilliant, this watch is an example in very good condition of Breguet's most refined production for civil use. An exceptionally flat repeater, it is fitted with the final development of Breguet's straight line lever escapement with jewelled pallets adjustable for depth, and with draw (the wheel teeth, being such that in the resting position, the lever is "drawn" clear of the roller, to avoid any frictional contact during the free arcs of the balance. Breguet was the first watchmaker in France to employ draw in his lever escapements). Furthermore, parachute type shock protection is fitted to both pivots of the balance staff, and the bimetallic balance is of the most advance design with the adjusting and poising screws inset into the rim. The balance spring has a terminal curve of the form that has since become known as the "Breguet balance spring". Quarter repeating is accomplished using a single gong with one hammer striking on an intermediate sprung steel block to ensure a clean and even strike and avoid potential extraneous vibrations that occur if the hammer is in too close proximity to the gong. Finally, the engine-turned silver dial is perfectly balanced despite the eccentric arrangement and inclusion of both the moon and the regulator sector. The case back, secured in place by bayonet fittings, is turned to reveal the winding square. Sold for 4800 Francs in 1816, this watch was among the most expensive, made by Breguet at the time, even more expensive than pocket chronometers with tourbillon regulator.