Short answer
Fake Audemars Piguet Royal Oak Offshore black ceramic watches copy two references: the 44mm 26415CE and the 43mm 26420CE. Replica prices run from $150 to $900. Top builds use zirconium oxide ceramic for the case and bezel. Low builds use steel with a black coating. Movement type, dial texture, and caseback engraving separate the tiers.
Genuine specs to compare against
Audemars Piguet lists the 26415CE.OO.A002CA.01 at 44mm across and 14.4mm thick. Case, bezel, and caseback ring are black ceramic. The caseback center is titanium with a sapphire window. Water resistance is 100 meters. The crystal is sapphire with anti-reflective coating on both faces. The strap is black rubber with a titanium pin buckle.
The movement is Calibre 3126/3840. It has 365 parts, 59 jewels, and a beat rate of 21,600 vibrations per hour (3 Hz). Power reserve is about 50 hours. The base is Calibre 3120 with a Dubois-Depraz chronograph module on top.
The 43mm 26420CE uses Calibre 4404. That movement is an integrated chronograph with a column wheel and a vertical clutch. Beat rate is 28,800 vph (4 Hz). Power reserve is 70 hours.
Replica tiers
- Low tier, $150 to $300. Steel case with PVD or DLC coating. Quartz or basic automatic movement. Some builds have a dead chronograph.
- Mid tier, $300 to $500. Steel with a ceramic coat, or low-grade ceramic. A7750 chronograph. Dial pattern is stamped and shallow.
- Top tier, $500 to $900. Solid zirconia ceramic case. Modified A7750 or a decorated clone. Rubber strap with titanium hardware. Laser-engraved caseback.
Five checks
- Weight. A ceramic 44mm Offshore on rubber sits near 110 to 130 grams. A steel-cased fake runs above 160 grams.
- Beat rate. Calibre 3126/3840 runs at 21,600 vph. A7750-based fakes read 28,800 vph on a timegrapher. That mismatch shows in the second hand sweep.
- Dial. The Mega Tapisserie squares on the genuine dial are cut with sharp edges and even depth. Replica squares look flat under 10x magnification.
- Caseback. Genuine engraving has consistent depth and clean edges. Laser etching on replicas is shallow and washes out under angled light.
- Pushers and crown. Genuine pushers are ceramic with rubber collars. Many replicas use steel pushers with paint.
What replicas cannot match
Ceramic hardness is about 1,200 to 1,400 HV on the Vickers scale. It resists scratches but chips on impact. Replica ceramic of lower purity chips faster at the bezel edges and lug tops. Bevel finishing is another gap. Genuine black ceramic parts get a brushed top and a polished chamfer. Most replicas brush the full surface or polish the full surface.
Serial numbers and reference stamps are a second gap. Genuine numbers are stamped into the titanium caseback. Replicas etch or print them. Service records cannot be verified on any replica.
Price context
The 26415CE listed above $30,000 when in production. It is discontinued. Secondary prices move with condition, box, and papers. Check current auction results for a real number. The replica prices above do not include shipping or customs seizure risk.