Nomos Glashutte Ahoi Datum 40mm Men's Watch

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Diving in style: At 40 millimeters in diameter, the NOMOS Glashutte Ahoi Datum Signalblau is very large, and very blue too: siren blue. It also tells time in the dark, and the day’s date is easily visible even in murky waters, all quite automatically so—as NOMOS caliber DUW 5101 is at work within. Glance through the sapphire crystal glass back and you can watch it as it divides time. The blue luster comes from the tempered blue balance spring of the NOMOS swing system, the watchmaking company’s proprietary escapement. We think it’s just as beautiful as the blue dial.

NOMOS caliber DUW 5101—ticks automatically and doesn’t mind counting the days. The date ring is set around the movement, keeping it flat and elegant despite the complication—a patent-protected construction. The bidirectional winding rotor is highly praised for its excellent winding performance, and the whole movement for its meticulous rate.