The Vacheron Constantin Chronomètre Royal Reference 6340 is a highly sought-after vintage dress watch from the 1960s, recognized for its exceptional precision and chronometer-grade movement. It is often considered one of the pinnacles of mid-20th-century Swiss watchmaking.

• Case: 18k yellow gold (750) with a diameter typically cited between 35mm and 37mm. It often features a polished stepped bezel and thick straight or concave lugs.

• Movement: Manual winding Calibre 1008BS (sometimes written as 1008/BS).

  • Hacking Mechanism: The "BS" stands for "Balance Stop," allowing the wearer to stop the seconds hand for precise time synchronization.

  • Certification: Stamped with the Geneva Seal (Poinçon de Genève) and adjusted to five positions, heat, cold, and isochronism.

  • Technical Details: 19 jewels, approximately 18,000–18,800 VPH, and based on the Jaeger-LeCoultre 450/453 ébauche but finished to a much higher standard.

• Dial: Usually a matte or satin silver dial with applied 18k gold baton or faceted hexagonal indexes and gold "Alpha" or baton hands.

• Crystal: Domed plastic (Plexiglas).