Ca. 12 x 11 x 6cm, original 3-part mahogany box with original key compartment, original key, case diameter 82mm, nickel case with screwed bezel, case number 250986, very fine and extremely rare Ankerchronometer according to patent V & C 101652, No. 400933, calibre 67-124, Guillaume balance, special fine adjusting device, original silvered regulator dial, blued steel hands, in complete original condition with original box and original key, intact, cleaning recommended. These Vacheron & Constantin deck chronometers are extremely rare and belong to the most accurate deck chronometers. Some of the boxes had a label 'Heure exact' in the lid, the 'exact time'! Only very few of these watches are known today, among others the No. 250999 according to the archives sold 1929, auctioned in Geneva 2005 in the special auction 'The Quarter Millennium of Vacheron & Constantin' for 13,800 Swiss Francs!