Patek Philippe combines tradition and innovation in a perpetual calendar and weekly calendar desk clock featuring a new manually wound caliber with a 31-day power reserve, +/- 1 second per day rate accuracy and user-friendliness worthy of a 21st-century timepiece. Resulting from a seven-year development process, the new rectangular 86-135 PEND S IRM Q SE caliber (912 components) has led to nine patent applications. To guarantee optimum performance, engineers have designed a genuine “precision regulator” at the heart of the movement. This new Sterling Silver timepiece is also distinguished by its refined, timeless exterior enhanced by green flinqué Grand Feu enamel.
Watch
Manually wound mechanical movement. 
Caliber : 86-135 PEND S IRM Q SE. 
Perpetual Calendar. 
Day, month, leap year and day/night indication displayed in apertures. 
Date indicated by hand. 
Week number indicated by a mobile frame. 
Moon phases. 
Hours and minutes displayed in a subsidiary dial. 
Large central seconds hand (jumping seconds). 
Central power reserve indication by hand.
Dial : Silvery opaline with black transfer-printed indications.
Cabinet : Sterling silver. 
Guilloched, green enameled panels (flinqué enamel). 
Vermeil decorative elements (yellow-gilt silver). 
Dimensions: 164.6 x 125 mm. 
Height: 76.73 mm. 
Humidity- and dust-protected only (not water-resistant).
Dimensions: 135 x 86 mm. 
Thickness: 28.55 mm. 
Number of parts: 912. 
Power reserve: 31 Days. 
Frequency: 28,800 semi-oscillations/hour (4 Hz).