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Patek Philippe splits its catalogue in two. Complications covers annual calendars, moonphases, world time and travel time. Grand Complications covers the harder territory above that. This page is the first group: watches that do more than tell the time without reaching for a minute repeater. Seven pieces at $1,150.

An annual calendar is not a perpetual one

An annual calendar knows which months have thirty days and which have thirty one, so it needs correcting once a year at the end of February. A perpetual calendar handles February too and needs no correction until 2100. Patek invented the modern annual calendar in 1996 and it remains the practical choice, because the mechanism is simpler and there is less to go wrong. Know which you are buying, because sellers use the terms loosely.

Subdial and aperture registration

These dials mix printed subdials with cut apertures, and the two have to agree. Where a day or month window sits, the aperture edge should be square, clean and correctly sized around the text behind it, with even margins on all four sides. Misregistration shows as text sitting low or crowded to one edge, and it is the most common flaw on complicated dials because it stacks two separate manufacturing steps.

The moonphase disc

Patek moonphase discs are usually a printed moon on a deep blue or black starfield, seen through a shaped aperture. The moon should have a crisp circumference and the disc should be centred so the moon tracks evenly across the window as it advances. Ask for a macro, and if you can, ask for two photos taken a day apart so you can confirm the disc actually steps.

All seven ship worldwide and carry a 2 year Reverie Watches warranty. The Grand Complications collection covers the tier above, and the full range is in the Patek Philippe replica collection.