Vacheron Constantin Traditionnelle perpetual calendar ultra-thin

The Traditionnelle perpetual calendar ultra-thin, reference 4305T/000G-H135, is part of Vacheron Constantin's Traditionnelle collection. The round case measures 36.5 mm in white gold and is paired with a white dial and sapphire crystal. It houses the automatic calibre 1120 QP, which carries the Poinçon de Genève hallmark established by the Republic and Canton of Geneva in 1886, and provides perpetual calendar functions including date, month, year and moon phase display, visible also through a display back.