Perpetual Calendar 2499/100 2499 — Fourth Series

Marked 2499/100. Essentially the third series with a flat sapphire crystalSapphire crystalA watch glass made from transparent synthetic sapphire, valued for its resistance to scratching., printed rather than champlevéChamplevéEnamel decoration made by cutting recesses into a metal surface, then filling and firing enamel in those recesses.-enamelA glass-based decorative material fused to metal by firing. In traditional dial-making, powdered enamel is applied in layers and heated in a kiln. A dealer’s colour or finish description alone does not establish this construction. dial lettering, and the 30-minute/second marker clashing with the date ring removed. Cases by Wenger until 1982, then Ateliers Réunis (key 28). Dated examples: case 2779166 sold 1980; 1982 example sold 1983.