Short answer
Replica Audemars Piguet carbon watches copy the look of AP forged carbon. Most do not copy the material. A large share of copies use a carbon-pattern film or a thin carbon sheet laid over a steel or resin case. Those cases weigh more than a genuine forged carbon case. They also show a repeating printed pattern instead of random strand orientation.
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Genuine AP carbon references
Audemars Piguet put forged carbon on a wristwatch in 2007 with the Royal Oak Offshore Alinghi Team chronograph, reference 26062FS. Later references include the Royal Oak Offshore Bumblebee chronograph (ref. 26176FO, 2010) and the Royal Oak Concept Laptimer Michael Schumacher (2015). Offshore cases in this group run 42 mm to 44 mm. Genuine builds pair the carbon case with a ceramic bezel, a titanium crown, and a sapphire crystal.
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What forged carbon is
Forged carbon is chopped carbon fiber mixed with resin and compression molded. Strand orientation is random, so the surface shows a marbled, cloudy pattern with no repeat. Woven carbon fiber, the common alternative, uses flat sheets of interlaced tows and shows a regular checkerboard twill. Density of forged carbon sits near 1.5 g per cm3. Titanium is about 4.5 g per cm3. Steel is about 7.8 g per cm3. A carbon case therefore weighs less than half the same volume of steel.
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What replica cases use
Three builds show up in the copy market. The first is a steel case with a hydrographic carbon print. It is the cheapest build and the print repeats across the surface. The second is a steel or resin base with a real carbon fiber sheet bonded to the surface. The weave is real. The structural case is not. The third is a molded carbon composite, close to the genuine process. It appears on a small number of high-tier builds. Weight is the fastest check. A 42 mm Offshore chronograph in molded composite weighs far less than the same watch with a steel case.
Movements and dimensions
Genuine 42 mm Royal Oak Offshore chronographs use the AP calibre 3126/3840, a 3120 base with a chronograph module. Replica versions use Asian 7750 chronograph movements with a decorated rotor, or a plate that mimics the 3126 layout. Case thickness on copies runs 15 mm to 17 mm against about 15 mm on the genuine watch. Bezel screws, pusher guards, and the tapisserie dial pattern are the common tells.
Price bands
Carbon-look AP copies list from about $150 to $400. High-tier builds with a molded composite case and a decorated clone movement list from about $600 to $1,000. Genuine forged carbon Offshore chronographs trade on the secondary market in the five-figure range. Listed prices for the Bumblebee and Alinghi Team sit between about $30,000 and $70,000, subject to reference and condition.
What no replica matches
Two things are hard to copy. The first is the forged carbon surface: random strand pattern with no repeat. The second is the weight and balance of the case in the hand. No replica maker publishes material certification, so composition claims rest on the seller's word. Ask for case weight in grams before buying.