Another concentric ring is graduated over 24 hours. The watch's second crown is used to align each city with its corresponding hour. Andersen Genève manufactures and never ceases to perfect this world-time module. The centre of the Tempus Terrae 25th Anniversary is in blue gold with a hand-guilloché pattern. A hallmark of Andersen Genève, this 21K gold contains tiny iron particles which, when oxidised, impart a unique blue colour. The same distinctive gold is used to craft the hand-guilloché oscillating weight of this soberly beautiful watch. To mark this complication's quarter-century, the Tempus Terrae is proposed as a limited series of 25 pieces in white gold, 25 in yellow gold and a further 25 in red gold.
Mechanical automatic with in-house module, 17 jewels, 21,600 vib/h, 21K blue gold oscillating weight with hand-executed guilloché motif, 40-hour power reserve.
Hours, minutes, world time, day/night indicator.
18K white, yellow or red gold, 39 mm. Sapphire crystals, front and back, hunter caseback. Water-resistant to 30 metres (3 bar/100 ft).
Blue gold with hand-guilloché "scale" motif. Silver-white city ring.
Hand-stitched alligator with buckle or folding clasp in the same gold as the case.