Audemars Piguet Royal Oak Stainless Steel Black Dial - 15400ST.OO.1220ST.01

Case & Dimensions

• The watch features a 41 mm stainless steel case with a slim profile of roughly 9.8 mm thickness.  
• It has the signature Royal Oak octagonal bezel, secured by eight exposed hexagonal screws.  
• The case back is solid steel and often includes a sapphire exhibition window, depending on the model.  

Dial

• The dial is a black “Grande Tapisserie” pattern, a textured grid motif that is quintessential to the Royal Oak series.  
• Hour markers are applied white-gold batons with luminescent coating, and the “Royal Oak” hands are also in white gold and filled with lume for visibility in low light.  
• There is a date window at 3 o’clock, with a date disc that matches the dial tone for a more integrated look.  

Crystal & Crown

• The watch uses a sapphire crystal on the front, which is glare-proofed.  
• The crown is a screw-down design, supporting water resistance.  

Movement

• Powered by the in-house Audemars Piguet Calibre 3120 — a self-winding automatic movement.  
• It has a power reserve of about 60 hours.  
• The rotor is made of 22k gold, giving a premium feel and efficient winding.  

Bracelet

• Fully integrated stainless-steel bracelet with a double-fold (AP) clasp, seamlessly continuing the design of the case.  
• The finish is a mix of brushed and polished steel, maintaining the sporty yet elegant identity of the Royal Oak.

Water Resistance

• Rated to 50 meters (≈ 165 feet), making it suitable for daily wear but not for serious diving.  

Additional Details

• The “Grande Tapisserie” pattern is made using a historical guilloché technique (“pounced ornament”) that gives the dial its depth and distinctive texture.  
• The case back on many versions is transparent, allowing a view of the Calibre 3120 movement (though some might have a solid back).