Ceramic on a Royal Oak is certainly not new to the drawing boards at Audemars Piguet; however, with the Royal Oak Perpetual Calendar, this is the first time the material has been extended to the bracelet as well. The perpetual calendar function is much revered in the industry, as well as the brand, and was introduced by Audemars Piguet in 1955 in an all-yellow gold version. This all-black 2017 version in handfinished black ceramic comes in a confidently sized 41mm case, and indicates day, date, month, astronomical moon, week of the year and leap year. The Grande Tapisserie dial lends a classic touch, and the caliber 5134 is visible through the glareproofed sapphire crystal case back. The ceramic, on the other hand, can withstand high temperatures and thermal blows, therefore allowing it to age well, and requires 30 hours of work versus the standard six it takes to produce a steel bracelet.