French minute repeating Seconde Morte pocket watch Circa 1960

Gold hunting cased repeater by Le Roy & Fils
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A fine minute repeating French gentleman’s pocket watch with independent jumping central seconds Seconde Morte, circa 1960.
Polished 18-carat gold, à goutte case with monogram and the dome signed and inscribed; Le Roy & Fils, Horlogers de la Marine, Palais Royal, 13 & 15 Galerie Montpensier, Paris, 296 Regent Street, London. Enamel dial with Roman radial hours, outer minutes/seconds track with Arabic five minutes/seconds numerals, centre second hand, and spade hands. Bridge movement, two hammers / two gongs, gold screw compensation balance.
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Diameter: 51 mm
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Weight: 130 g
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Signed: Le Roy & Fils
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Seconde morte, Dead seconds.
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.