Watchmakers in the late eighteenth and early nineteenth centuries, John Arnold and his son were highly regarded as makers of precision marine chronometers – instruments used to calculate longitude at sea. This Globetrotter watch is part of Arnold & Son's Instrument collection, inspired by these first chronometers. The Northern Hemisphere is depicted in particular detail and in three dimensions at the centre of the dial. This rounded world-time display makes one complete rotation every 24 hours, sweeping a sapphire disc that is transparent between 06:00 and 18:00 (for daytime) and has a metallic treatment from 18:00 to 06:00 (for night-time). The time anywhere in the world can thus be read at a glance on this miniature map. The hour and minute hands appear from under this globe, which appears to float above the dial. An impressive bridge adds the final seal.
HM Perpetual Moon Gold