A fine and rare gold automatic sweep seconds wristwatch with date, Vacheron & Constantin, ref. 6594 circa 1965

18k, nickel lever movement, stamped twice with the seal of Geneva, 18k gold rimmed rotor, 29 jewels, mono-metallic balance, precision regulator, adjusted to heat, cold, isochronism and 5 positions, silvered dial, applied faceted baton numerals, aperture for date, polished circular water-resistant-type case with sloped bezel, elongated straight lugs and screw-down case back, case, dial and movement signed, with 18k gold Vacheron & Constantin buckle.