The 15500ST.OO.1220ST.01 is the current-generation time-only Royal Oak in steel with a blue dial, and this replica Royal Oak 15500ST in blue reproduces that benchmark configuration at 41mm. The 15500 replaced the long-running 15400 series with an updated movement and minor case refinements. Blue remains the most popular dial color across the entire Royal Oak range, and on the 15500 the Grande Tapisserie texture catches light in patterns that shift constantly between royal blue and near-black depending on the viewing angle.

Technical Overview

• Case diameter: 41mm
• Case material: stainless steel
• Dial: blue Grande Tapisserie with applied white gold markers
• Bezel: octagonal stainless steel with 8 hexagonal screws
• Crystal: sapphire with anti-reflective coating
• Bracelet: integrated stainless steel with AP double folding clasp
• Movement: automatic
• Functions: hours, minutes, seconds, date at 3 o’clock

The 15500 series introduced a new-generation caliber with improved power reserve over the 15400’s movement. External dimensions remain nearly identical, but the internal upgrade brought the Royal Oak’s base movement in line with modern industry standards.

Inside the Movement

Audemars Piguet’s automatic caliber in the 15500 operates at 28,800 vph and delivers approximately 60 hours of power reserve. The rotor is visible through the sapphire caseback, finished with circular graining and the AP monogram. The date quickset function corrects forward, activated by pulling the crown to its first position. The added power reserve over the 15400’s caliber means a full weekend off the wrist without losing time. For the same dial color on a different strap, the 15500ST blue on rubber swaps the bracelet for a sportier profile. Both options live in the Royal Oak collection alongside chronographs, perpetual calendars, and tourbillons.

What Sets It Apart

The 15500ST.01 in blue is the volume reference for the entire brand. It is the watch most commonly associated with the Royal Oak name in current production. The integrated bracelet, octagonal bezel, and blue Tapisserie dial form the combination that Gerald Genta’s 1972 original evolved into over five decades. Owning this reference means owning the default configuration. There is no version more central to what the Royal Oak represents today. This replica Royal Oak 15500ST in blue is the entry point and the reference standard for the collection.