Gustave SANDOZ, Horloger de la Marine Yellow gold (750) collar watch. Bezel, caseband and back cover with swirling guilloche decoration. White enamelled dial, signed, black painted hour markers, Roman numerals for the hours, railway and Arabic numerals for the minutes. Hand-wound mechanical movement, signed. Yellow gold (750) dust cover numbered inside 16936, and engraved "N°10806B Gustave SANDOZ Horloger de la Marine. Anct au Palais Royal 10 rue Royale Paris Gustave-Roger Sandoz Fils et Successeur". Suspension ring mobile 360° of form trilobate and godronnée. Gross weight : 26,3 g. Case diameter : 29 mm. - Total height with hanger : 4,4 cm. Minor scratches from use.