Patek Philippe 5205G-013 "Bleu Dégradé" 18kt White Gold Annual Calendar with Moonphase, Blue Gradient Sunburst "Bleu Dégradé" Dial with White Gold Luminescent Dauphine Hands, Self-Winding Automatic Movement, Sapphire Crystal Skeleton Exhibition Case Back, Fitted on a Hand-Sewn Alligator Leather Strap Strap, 40mm

It includes a screw-down winding crown braced by two correctors in the right-side case band and two more in the left-side case band for adjusting the annual calendar functions. There is an exhibition sapphire display case back, and the 40mm diameter solid two-body case, rounded bezel, and skeletonized lugs are all polished. The dial has gradient blues with polished white gold dauphine hands with luminous inserts and a luminous white center sweep seconds hand. It has thin concentric white gold rings with applied faceted white gold hour indices around a perimeter gold pip minute/seconds scale. There are three trapezoidal aperture windows, including a day window at 10 o’clock, a date register at 12 o’clock, and the month is at 2 o’clock. A large white gold ringed combination 24-hour indicator/moon phase is at 6 o’clock, with luminous white Arabic hour markers and a white indicator hand. It has a 45-hour power reserve at full wind, and it’s water resistant to 30 meters/100 feet. The 13.55mm thick case, dial, and movement are all signed.

This Patek Philippe Annual Calendar 5205G-013 has a mechanical automatic self-winding Patek Philippe caliber 324 S QA LU 24H/206 (based on their caliber 324 SC) movement. It’s rhodium-plated with oeil-de-perdrix and fausses cotes embellishment, and the Patek Philippe seal. It’s constructed with 34 jewels, 356 components, 10 bridges, an index regulator, and a straight-line lever escapement. It has the patented Patek Gyromax balance that adjusts to cold, heat, isochronism, and 5 positions, and a 21k gold rotor with the Calatrava symbol. There is a shock absorber mechanism, a self-compensating free-sprung flat Spiromax balance spring, and the mechanism oscillates at 28,800 vph (4 Hz).

Recognizable by its three apertures along an arc for displaying the day, the date, and the month; the Reference 5205 Annual Calendar pairs its white-gold version with an elegant sunburst dial in two tones of blue shading. The case construction is notable for the slightly concave bezel and the delicately pierced strap lugs. A sleek, dynamic and very contemporary style graces this calendar watch requiring adjustment only once a year.