Released in 2014, the Nautilus ref. 5990/1A is perhaps the most capable Nautilus reference on the market thanks to its dual-time function, its pair of AM/PM indicators and 60-minute chronograph. Featuring a beautiful horizontally embossed grey dial, the ref. 5990's symmetrical dial design creates a beautiful aesthetic as its date wheel and chronograph subdial mirror one another at 12 o'clock and 6 o'clock, respectively. Featuring the legendary stainless steel construction that has catapulted the Nautilus to dizzying heights, the ref. 5990 comes with the Nautilus' signature octagonal bezel and iconic integrated bracelet.