Swiss extremely rare pocket watch with 24h indication Circa 1915

Gold open faced pocket watch by Vacheron & Constantin
–
A Swiss extremely rare and very fine Geneva gentleman’s pocket watch with 24h indication, circa 1915.
Engine turned 18 carat gold à goutte case with signed gold dome and inner lid with dedication engraving: “Recuerdo del Nono a su Nieto Jorge”. Signed enamel dial with radial Roman hours, auxiliary seconds and blued spade hands. Bridge movement, frosted, gilt, wolfteeth winding wheels, gold screw compensation balance, blued balance spring, patented fine adjusting device via threaded rod “Déposé 1904”, counterpoised lever.
–
Diameter: 60 mm
–
Weight: 143 g
–
Signed: Vacheron & Constantin à Genève