French brass deck watch with chronometer escapement Circa 1839

Marine chronometer in mahogany box with slide and window
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A marine deck chronometer made by Breguet in Paris, France, circa 1839. The open faced brass case is mounted with a gimbal suspension in the original mahogany box with slide and window. The numbered original silvered dial has  off center time display, a large seconds display and blued steel hands. The numbered movement has a Breguet chronometer escapement with helical hairspring and an original balance.
The dial is signed.
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Dimensions: 220 x 190 x 180 mm
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Signed: Breguet
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According to the Breguet archives, chronometer #.278 with escapement # 296 was sold in May 1839.