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The big news concerning Audemars Piguet’s brand-new Millenary Quadriennium is that the timepiece’s “annual” calendar is really “quadriannual,” which means it needs only to be adjusted once every leap year.

The Audemars Piguet Millenary Quadriennium is housed in a 47 x 42 mm rose gold case, and like all timepieces from the Millenary line, it looks simply divine.

At Hong Kong’s Watches & Wonders fair earlier this month, Audemars Piguet introduced the brand-new Millenary Quadriennium, a timepiece outfitted with not only the AP Escapement and a double balance spring integrated into its manually wound Caliber 2905/B01, but also a very different type of annual calendar.

Sunt enim loca e quibus si hoc anno sulphur effossum fuerit; intermissa fossione per quadriennium redeunt fossores & omnia sulphure, ut autea, rursus inveniunt plena.

Such was the Arts' Faculty of the 15th century; a dreary, single-manned, Aristotelian quadriennium.