Founded in Geneva in 1755, Vacheron Constantin is the oldest continuously operated watchmaker in the world, with one of the most extensive archives in the business. Its designers have often looked to that history for inspiration, introducing new lines like Traditionnelle, which debuted in 2007 with vintage details, including fluted case backs and baton-style indexes. Now the company is presenting three Traditionnelle models that incorporate a perpetual calendar and moon phase display into 36.5-millimeter cases. Harking back to smaller-faced styles that were popular at the turn of the 20th century, the watches are offered with pink- or white-gold cases, silver-toned opaline dials and alligator-leather straps.