The Titanium 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 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 integrated bracelet watchesUnder 11 mm thickDisplay back
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Reference26585XT.OO.1220XT.01
TypeIntegrated bracelet
Price$196,000 · approx (CHF 175,000); limited to 150
Case diameter41.0 mm
Thickness9.9 mm
Lug-to-lug–
Water resistance20 m
Weight–
OriginSwitzerland
MovementAutomatic
CaliberAP calibre 5135
Power reserve40 h
ComplicationsPerpetual calendar, Date
TitaniumTitanium (grade undisclosed)
Surface treatmentOpenworked; BMG bezel, caseback frame and bracelet mid-links
Nickel-freeYes
Bracelet / strapTitanium bracelet (BMG mid-links)
CrystalSapphire
Display backYes
DialOpenworked
Lume–
AvailabilityOffered
StatusCurrent (limited to 150)
High confidence Verified 2026-06-21 Source: Monochrome Maker / listing ↗
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