Technically interesting Swiss gold chronograph Circa 1872

Gold hunting cased chronograph by Serretan
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A technical highly interesting and heavy Swiss 18 carat gold hunting cased chronograph with independent seconds and 1/5th second diablotine, circa 1872. Extremely high-quality calibre with tandem winding in the manner of Mairet, gold wheels. White enamel dial with outer chronograph scale, independent centre seconds, flashing 1/5th second diablotine and blued fleur-de-lys hands. Engine-turned à goutte case, monogram to the front, case band with pusher for releasing and stopping the chronograph.
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Diameter: 53 mm
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Weight: 143 g
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Signed: Serretan à Lausanne
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The feature known as a diablotine is a small subsidiary dial on a chronograph or independent centre seconds pocket watch, the hand of which moves in a jumping manner at intervals of 1/4 or 1/5th of a second. The term literally means ‘little devil’. The diablotine is halted when the chronograph or centre seconds is stopped and the fractions of a second can be read.