Rare 18K gold pocket watch with seconde morte Circa 1860

Unsigned 18K gold hunting cased pocket watch
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An interesting and rare, early gold hunting cased pocket watch with seconde morte in very fine quality, circa 1860.
Engine turned 18K gold à goutte case with engraved monogram, floral relief rim, the dome signed and inscribed, Seconde Independante, and case hallmark DG. Enamel dial (small crackle) with Roman radial hours, outer minutes/seconds track, centre seconds hand, and special beautiful filigree steel hands. Fine lever movement with ring lever, tandem winding and golden impellers, independent stop second.
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Diameter: 51 mm
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Weight: 115 g
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Signed: No name
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Seconde Morte. A hand that jumps forward when the second has elapsed. Breguet used the expression seconde d’un coup or “sudden second”.
Generally, the jump of a hand is a distinctive feature of a quartz watch. In mechanical watchmaking, this “function” is a technical feat.