Gold & diamond Watch no. 34646

Case: Gold, rear cover with diamond set "M", hinged cuvette signed "B. Haas Jne., Brevete, Geneve, Besancon Paris" Dial: White enamel, Roman numerals, fancy blued steel hands, unsigned. Movement: Gilt, cylinder escapement, unsigned. Provenance: 18?? - Haas Neveux, Geneve 2023 - Drouot auction, 25 Jun 2023, "B.HAAS Collar watch. N° : 34646. Circa: 1850. Yellow gold 750/1000 collar watch. Round case. Back decorated with a stone-set "M". White enameled dial. Black baton hour-markers, iron track and Roman numerals. Black Louis XV Roskopf-style hands. Double case in yellow gold 750/1000 numbered 34646 and engraved "B.Haas Breveté Genève Besançon Paris". Mechanical movement with key winding. Diameter: 31.5 mm. Gross weight: 23.1 gr."