The Wristwatch Field Guide

Audemars Piguet Royal Oak Perpetual Calendar Openworked 150th Anniversary (Titanium)

26585XT.OO.1220XT.01

The Audemars Piguet Royal Oak Perpetual Calendar Openworked 150th Anniversary (Titanium) is a current-production integrated bracelet watch with a grey titanium (grade undisclosed) case, finished with openworked; bmg bezel, caseback frame and bracelet mid-links. It measures 41.0 mm across, 9.9 mm thick, and is water resistant to 20 m. Inside is the AP calibre 5135 automatic movement, with 40 h power reserve. Complications: Perpetual calendar, Date. Priced from $196,000 (approx (CHF 175,000); limited to 150). Brand origin: Switzerland.

Titanium and ceramic integrated bracelet watchesTitaniumDisplay back
Reference
26585XT.OO.1220XT.01
Type
Integrated bracelet
Price
$196,000 · approx (CHF 175,000); limited to 150
Case diameter
41.0 mm
Thickness
9.9 mm
Lug-to-lug
Water resistance
20 m
Weight
Origin
Switzerland
Movement
Automatic
Caliber
AP calibre 5135
Power reserve
40 h
Complications
Perpetual calendar, Date
Material
Titanium
Grade / type
Titanium (grade undisclosed)
Colour
Grey
Hardness
Construction
Surface treatment
Openworked; BMG bezel, caseback frame and bracelet mid-links
Caseback
BMG (frame); sapphire display back
Nickel-free
Not verified (clasp or buckle material not confirmed)
Bracelet / strap
Titanium bracelet (BMG mid-links)
Matching bracelet
Standard
Crystal
Sapphire
Display back
Yes
Dial
Openworked
Lume
Availability
Offered
Status
Current (limited to 150)
High confidence Verified Jul 2026 Source: Monochrome Maker / listing ↗
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Frequently asked questions

What is the case material of the Audemars Piguet Royal Oak Perpetual Calendar Openworked 150th Anniversary (Titanium)?

The Audemars Piguet Royal Oak Perpetual Calendar Openworked 150th Anniversary (Titanium) has a grey titanium (grade undisclosed) case with a bmg (frame); sapphire display back caseback. This is confirmed against the maker spec.

What size is the Audemars Piguet Royal Oak Perpetual Calendar Openworked 150th Anniversary (Titanium)?

It is 41.0 mm in diameter, 9.9 mm thick, and water resistant to 20 m.

How much does the Audemars Piguet Royal Oak Perpetual Calendar Openworked 150th Anniversary (Titanium) cost, and is it available?

It is current-production and lists from $196,000.

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