Zenith's indefatigable El Primero movement goes under the knife to get the skeleton treatment in a sapphire covered, open worked display of its functions and features, as the new Chronomaster Grande Date continues to be the benchmark for contemporary chronographs.

If the secret to winning a juror's affection is by standing out from its rivals, then the spellbinding débutante Everywhere by Krayon, with Universal Sunrise and Sunset display, might be enjoying a celebratory end to the year of its arrival on the world stage of Haute Horlogerie.

Perennial purveyors of horologic tours de force, Greubel Forsey, return to GPHG with an extraordinary and fully loaded calendar watch, the Quantième Perpétuel à Équation, which is so complex that it could have been entered in at least three categories.

With mainstream design values and a display which combines chronograph with calendar and moonphase, can Delma strike gold and successfully take on the industry heavyweights with the Klondike Moonphase automatic?

Slender, sleek and stealthy in its grainy black ceramic case, the Royal Oak Perpetual Calendar by Audemars Piguet fuses centuries of watchmaking tradition with cutting edge materials and classic styling to dramatic effect.

It's been three years since A. Lange & Söhne scooped the honours in the GPHG Calendar category, but they're back in 2017 with an all-new hand winding calibre and the magnificent 1815 Annual Calendar.