We all know someone who runs a dozen things at once and still looks like they have all the time in the world. Their calm is not a lack of effort, It is effort so well organised that it has become invisible. The most impressive people rarely look busy, and the same is true of the most impressive watches.

Vacheron Constantin's newest Overseas belongs to that quiet school. Created to mark 30 years of the collection, the Overseas Perpetual Calendar Ultra-Thin pairs a white-gold case with an azure dial, and only 200 will ever be made.

Behind that serene face, a great deal is happening. The self-winding caliber 1120 QP/1 is just 4.05mm thick, yet it tracks the date, day, month, leap years and phases of the moon. It will not need correcting until 2100, which is a generous promise to make. The entire watch is only 8.1mm thick, and the case measures 41.5mm across.

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Turn it over and the effort finally shows. Through the sapphire case back you can admire the movement's 276 components, wound by a 22k-gold rotor engraved with the Overseas compass-rose motif.

Vacheron describes the azure as lighter and less saturated than the blue the Overseas has worn since 2016. Set against white gold, it gives a deeply serious piece of haute horlogerie a relaxed, almost sunlit air, like a person who has everything in hand and does not feel the need to announce it.

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The watch arrives on an integrated white-gold bracelet, with white and denim-blue rubber straps alongside. All three swap without tools, so the same watch can be formal in the evening and easy by the weekend.

Complication does not have to mean complication. Thirty years into the Overseas story, Vacheron has found an elegant way to celebrate, by showing that real mastery is what you barely notice.