Your one-minute primer to the Audemars Piguet Royal Oak Perpetual Calendar.

For those who have yet to pull the trigger on acquiring a Royal Oak, this piece might just provide the extra nudge. Causing a furore among fans during its SIHH 2017 debut, it is the first full-ceramic model of the family. This might not sound like a big deal, but trust us, it is. The high-tech material, which is resistance to scratches and high temperatures, is notoriously difficult to work with. For instance, it takes AP specialists 30 hours to machine, polish, finish, and assemble a single ceramic bracelet. As icing on the cake, its in-house automatic calibre is on display via a sapphire crystal caseback.

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