• The Industrial Revolution led to the perception of time as a fourth dimension. Everything that is mechanically measurable must be displayed function by function. Among the most iconic watches of the Maison designed for a clientele of often well-known collectors, the grand complication pocket watches combine the chronograph —with or without the split-second hand, but notably featuring the Gregorian perpetual calendar with moon phases as well as striking functions such as the hour, quarter-hour and minute repeater. This watch, extremely refined despite the apparent simplicity of its enameled dial, hides a grand complication movement. Upon lifting the bottom cover of the case of this Winner of the First Prize for Chronometry of Geneva in 1884, one can find a perpetual triple calendar, highlighted by a grand feu enameled dial in brilliant white. At the end of the 19th century, double-sided watches were an anomaly, making them very rare.

• Vacheron Constantin was one of the few Maisons to designate a special atelier to complicated and very complicated pocket watches. Most of the pieces were made-to-measure watches. For the most complex pieces, over three years of work was required.