Audemars Piguet Royal Oak Perpetual Calendar 41 Night Blue Dial Steel on Steel 26574ST.OO.1220ST.03

Audemars Piguet Royal Oak Perpetual Calendar 41 Night Blue Dial Steel on Steel 26574ST.OO.1220ST.03 The Audemars Piguet Royal Oak 26574ST.OO.1220ST.03 is one of the most mechanically complex and aesthetically revered references in the permanent Royal Oak collection. This specific “.03” iteration was introduced in 2021, featuring a return to the classic “Night Blue, Cloud 50” dial—the exact iconic shade of the original 1972 Royal Oak. Unlike previous versions that utilized varying shades of blue, the .03 uses a PVD-coated “Grande Tapisserie” dial that offers a richer, deep-navy consistency. It manages to house 374 components in a case just 9.5 mm thick, making it one of the thinnest and most elegant automatic perpetual calendars on the market. The 41 mm case is crafted from brushed and polished Stainless Steel and features an integrated bracelet that is widely considered the industry benchmark for finishing. The dial is a masterclass in information density, displaying the day, date, month, leap year, and an astronomical moon phase. Additionally, a central white hand tracks the week of the year against a specialized 1-to-52 scale on the inner bezel—a rare complication that distinguishes AP’s Quantième Perpétuel from its competitors. Key Features Model Name Royal Oak Perpetual Calendar Reference Number 26574ST.OO.1220ST.03 Case Material Stainless Steel Dimensions 41 mm (9.5 mm thick) Water Resistance 20 metres (65 feet) Dial Night Blue “Grande Tapisserie” Crystal Glareproofed Sapphire (Front and Back) Movement Type Self-winding (Automatic) Power Reserve Approx. 40 hours Caliber Manufacture Calibre 5134 Complications Day, Date, Week, Month, Leap Year, Moon Phase Moon Phase Astronomical Moon (Aventurine Glass) Bracelet Stainless Steel with AP Folding Clasp The Night Blue “Cloud 50” Dial is a historical tribute. Tonal Sophistication: The sub-dials are finished in the same “Night Blue” as the main dial, but their circular graining creates a subtle contrast that improves legibility. Aventurine Moon Phase: The moon phase at 6 o’clock is crafted from aventurine glass, which mimics the sparkling effect of a starry night sky. The moon itself is a photorealistic laser-ablated disc. The Weekly Indicator: The central hand with a white arrowhead points to the specific week of the year (1–52) on the dial’s flange, a complication specifically favored by European business professionals. The movement is the Manufacture Calibre 5134. Ultra-Thin Engineering: Based on the legendary Calibre 2120, the 5134 is only 4.31 mm thick, allowing the overall watch to maintain its “Extra-Thin” profile despite the 374 parts required for the perpetual calendar. Astronomical Accuracy: The moon phase is so precise that it only requires a correction of one day every 122 years and 45 days, provided the watch is kept wound. Automatic Convenience: Unlike the original manual-wind perpetual calendars, the 5134 features a central rotor (visible through the sapphire back) finished in 22-carat gold with an openworked AP logo.