The Audemars Piguet Royal Oak Offshore Chronograph 25940SK is a historic and highly recognizable luxury sports timepiece. Better known to collectors as the original "Rubberclad," this model holds a unique place in horological history as the first watch to utilize a rubber-coated bezel over a stainless steel core.

• The Panda Dial: It features a black "Méga Tapisserie" waffle-textured dial offset by striking, recessed silver chronograph sub-dials. This layout creates the iconic, highly legible "Panda" look. 

• Rubberclad Architecture: The signature octagonal bezel and the chronograph pushers are wrapped in vulcanized rubber, offering a dark matte contrast against the hand-finished satin and brushed stainless steel case.

• Wearability: While it features a bold 42mm case diameter, its thickness is kept to 14.5mm. This makes it slimmer and more compact on the wrist than modern 42mm Offshore iterations.

• The watch relies on a modular automatic movement pairing a thin, high-frequency base caliber (historically derived from Jaeger-LeCoultre) with a Dubois Dépraz vertical clutch chronograph module. Because the chronograph module sits directly on top of the base movement, it produces the characteristic "sunken date" window deep under the dial crystal that early Offshore models are famous for.

• Feature Specification

• Reference Number 25940SK.OO.D002CA.01 (and related sub-variants)

• Case Dimensions 42mm Diameter × 14.5mm Thickness

• Case Material Stainless Steel with a Black Rubber-Clad Bezel

• Movement Automatic AP Caliber 2326/2840 (Modular Chronograph)

• Power Reserve Approximately 38 Hours

• Water Resistance 100 Meters (10 ATM) with Screw-Down Crown

• Strap/Band Integrated Black Vulcanized Rubber with an AP Folding Deployant Clasp

• Complications Chronograph, Magnified Sunken Date at 3 o'clock, Tachymeter Scale