A complication much appreciated on ladies’ watches, the moon-phase indication has enjoyed pride of place since 2013 on Reference 7121J. Patek Philippe reinterprets this mechanical poem by equipping it with a white gold case and an elegant blue dial on which the displays stand out like stars in the night sky. The dial is enhanced by a sunburst decoration creating subtle light effects. The Manufacture also reinforces the jewelry dimension of this model by illuminating its bezel with a double row of 132 brilliant-cut diamonds based on the exclusive lacy Dentelle gemsetting technique. Beating at the heart of this jewelry-watch is manually wound mechanical Caliber 215 PS LU : the smallest Patek Philippe complicated movement that helps maintain a daintily elegant 33 mm case diameter.

Watch
Manually wound mechanical movement. 
Caliber : 215 PS LU. 
Moon phases. 
Small seconds.
Dial : Blue sunburst, gold applied Breguet numerals.
Case : White gold. 
Diameter: 33 mm. 
Thickness: 8.35 mm. 
Water-resistant to 30 m. 
Sapphire crystal case back.
Gemsetting : 132 diamonds: ~1.09 cts. (bezel), “Dentelle” setting.
Strap : Alligator leather with square scales, hand-stitched, shiny blue. 
Prong buckle. 
Diameter: 21.9 mm. 
Thickness: 3 mm. 
Number of parts: 157. 
Jewels: 18. 
Power reserve: min. 39 hours, max. 44 hours. 
Balance: Gyromax®. 
Vibrations/hour: 28 800 (4 Hz). 
Balance spring: Spiromax®.