Vacheron Constantin. A very fine and important 18ct yellow gold astronomical keyless minute-repeating dress watch with perpetual calendar, phase and age of the moon, split-seconds chronograph and progressive 30 minute register together with a Vacheron Constantin Certificate of Authenticity
Genève, No.511624, Case No.360509, Ref.6526. Made in 1964
36-jewel Cal.17''' JSMCCRVQ, rhodium plated movement with "fausses côtes" decoration, straight line lever escapement, cut bimetallic compensation balance adjusted to heat, cold, isochronism and five positions, Breguet balance spring, swan-neck micrometer regulator, repeating on gongs via slide in the band, split seconds chronograph with visible work, operated by means of the winding crown with push piece in the band, matt silver dial with applied gold indexes, outer minute/second track and fifth second timing scale, sunk subsidiary dials for days of the week, months of the leap year cycle with outer minute register, date, and seconds with inner moon phase aperture and lunar age sector, gold baton hands, very fine polished and satiné case with bevelled bezels and snap on back 51mm.