Gold Observatory Chronometer no. 31804

Case: Yellow gold, hunter, blue enamel "IB" monogram, hinged cuvette signed "Chronometre No. 31804 avec Bulletin de 1ere Classe de l'Observatoire de Geneve, Ancne Maison B. Haas Jne, Haas Neveux & Cie., sucrs, 5 uai du Mont Blanc, Geneve, 7 rue Scribe, Paris". Dial: White enamel, unsigned, Breguet numerals, Gold Louis XV hands, sunken subsidiary seconds dial, blue outer five minute numerals. Movement: Nickel, Guillame bi-metallic balance with gold & platinum screws with blued steel balance spring with Breguet overcoil with polished steel kidney piece, micrometer regulator, jewel cap on lever pivot, counterpoised lever, wolf's tooth winding, numbered "31804" on main plate. Provenance: ???? - Haas Neveux, Geneva ???? - Observatoire de Geneve 2014 - Dr Crott 10 May 2014, "Haas Neveux & Cie., Genève / Paris, "Chronométre No. 31804" avec Bulletin de 1ère Classe de l'Observatoire de Genève, Movement No. 31804, Case No. 31804, 51 mm, 115 g, circa 1895 A very fine lever chronometer for the German market - formerly with Bulletin de 1ère Classe de l'Observatoire de Genève Case: 18k gold, enamelled monogram "JB", polished, à goutte, signed gold dome. Dial: enamel, Arabic numerals, auxiliary seconds, gold Louis XVI hands. Movm.: bridge movement, rhodium-plated, "fausses côtes" decoration, wolfteeth winding wheels, gold screw compensation balance, index spring fine adjusting device, counterpoised lever." 2018 - eBay #202304399766 €4,950 Germany Sept 2018 2018 - antique-pastime.com Japan, 2018-11-24 ¥1,950,000