Audemars Piguet Royal Oak Perpetual Calendar Openworked "150th Anniversary"

A Historic Farewell to Caliber 5135

The Royal Oak Perpetual Calendar Openworked “150th Anniversary” marks the final appearance of Caliber 5135, as Audemars Piguet retires the movement that has powered its openworked self-winding perpetual calendar watches for nearly a decade. This exclusive 150-piece limited edition blends cutting-edge materials with a vintage-inspired design, drawing inspiration from a historic pocket watch (Ref. 25729) displayed at the Musée Atelier Audemars Piguet.

Innovative Materials & Timeless Aesthetic

This Royal Oak seamlessly integrates high-tech materials with classic watchmaking. The titanium case and braceletare paired with a Bulk Metallic Glass (BMG) bezel and caseback, creating a striking contrast with the sapphire dial. The blue brass inner bezel and 18kt white gold hour markers and hands—coated with luminescent material—enhance readability while maintaining the watch’s vintage charm.

Technical Specifications

Case Size: 41mm x 9.9mm
Materials: Titanium case & bracelet, BMG bezel & caseback
Crystal: AR-coated sapphire with sapphire display back
Water Resistance: 20 meters

Precision Movement: Caliber 5135

Movement: Swiss automatic Audemars Piguet in-house Caliber 5135
Power Reserve: 40 hours
Frequency: 19,800 vph
Jewels: 38

Complications & Functions

Hours & Minutes
Perpetual Calendar with:

Week Indication
Day & Date
Astronomical Moon Phase
Month & Leap Year Display

Strap & Clasp

Bracelet: Titanium with BMG studs
Clasp: Three-blade titanium folding clasp

Pricing & Availability

MSRP: 175,000 Swiss Francs
Limited to 150 pieces worldwide

The Audemars Piguet Royal Oak Perpetual Calendar Openworked “150th Anniversary” is a collector’s masterpiece, marking the end of an era for Caliber 5135. A true investment piece for horology enthusiasts.