Ca. Ø51.5mm, ca. 91g, 18K gold, special case with very beautiful integrated hinge, case hallmark Vacheron & Constantin No. 231416, very fine Ankerchronometer movement with especially large chronometer balance, fine adjusting device, chronograph with register, movement also signed Vacheron & Constantin, No. 374500, signed original enamel dial with 30-minutes-counter, golden hands, rare original box with double signature Vacheron & Constantin and J.A.M. Mulder La Haye, in excellent condition, hardly used, case with small signs of use, in working order. This chronograph is a special quality, a rare Ankerchronometer. Comparable pieces have been sold for ca. 15,000€/ Swiss Francs, e.g. in the special auction 'The Quarter Millennium of Vacheron & Constantin' (source: https://www.cortrie.de/go/K21).