Ultrathin Tourbillon features a sleek bassiné case made of red gold (5N) or platinum (Pt 950), measuring 41.5 mm in diameter and 8.3 mm in thickness. The bezel has been reduced to a fine metal band, highlighting the exquisite tourbillon mechanism. The offset display and the tourbillon aperture echo the way information was arranged on John Arnold’s marine chronometers. With the bezel reduced to a fine metal band, the whole highlights the one-minute flying tourbillon mechanism.