Here is another outstanding example of Audemars Piguet's tribute to the 40th Anniversary of their iconic Royal Oak model
The Royal Oak self-winding watch appears in a new more contemporary 41 mm 18K rose gold case, replacing the current 39 mm size.
Its dial has been revisited to accentuate the “family likeness” that makes each Royal Oak so immediately recognizable.
Case: 18K rose gold case, glare-proofed sapphire crystal and case back, screw-locked crown
Dial: Black dial with “Grande Tapisserie” pattern, pink gold applied stick hour-markers and Royal Oak hands with luminescent coating
Bracelet: gold bracelet with AP folding clasp
Functions: hours, minutes, center seconds, date
Automatic Movement - Frequency of balance wheel:3,00 (=21’600 alternances/hour) 
Direction of automatic winding: Bidirectional
Type of oscillating weight: Monobloc in 22K gold
Power reserve: 60 hours
Date / Date in Dial aperture at 3 o'clock
Self-winding Manufacture Caliber 3120
Water-resistant to 50 meters / 165 feet.