Short answer
A convincing Omega Planet Ocean Ultra Deep 6000m replica should match the 45.5 mm case, the roughly 18 mm thickness, the Manta lug profile, and the engraved 6,000 m depth rating. It will not match the real watch's actual pressure resistance, grade 5 titanium feel, or Master Chronometer movement. Judge it as a visual replica, not a dive tool.
What the real Ultra Deep gets right
The genuine Ultra Deep is a technical statement piece. Omega rates it to 6,000 m, builds it in titanium, and fits a Co-Axial Master Chronometer movement. That combination is why replicas exist. The case is big and thick, the dial has a deep gradient, and the bezel is a serious dive scale, not decoration. A replica can copy the look. It cannot copy the engineering.
Specs to check on a replica
- Case: 45.5 mm diameter, about 18 mm thick, titanium or titanium-colored steel. Steel versions weigh noticeably more.
- Lugs: the Manta lug shape is the tell. Replicas often soften or shorten it.
- Dial: blue-to-black gradient, applied indices, date at 6, broad arrow hands.
- Bezel: 60-minute dive scale, crisp castellation, no backplay, aligned triangle at 12.
- Caseback: deep engraving, correct text, clean seam alignment.
- Crystal: domed sapphire with anti-reflective coating. Mineral glass is a downgrade.
- Strap: rubber or titanium bracelet with correct end links and clasp markings.
Movement and weight expectations
Most replicas use a modified ETA 2824 clone or a decorated automatic. The real watch uses Omega's 8912, a METAS-certified Master Chronometer with a 60-hour power reserve and high magnetic resistance. A replica will not have that. Ask for a movement photo, a timegrapher reading, and a power reserve check. Weight is another tell. Genuine titanium feels light for its size. Steel replicas feel dense. If a seller claims titanium but the watch weighs like steel, walk away.
Depth rating: what 6000m means on a replica
No replica should be treated as a 6,000 m dive watch. The engraving is cosmetic. Gaskets, crystal thickness, caseback sealing, and crown threads are not certified. I would not take any replica past a swimming pool, and I would rinse it in fresh water after. If a seller claims pressure testing to 6,000 m, ask for documentation. A $300 replica does not come with it.
Price tiers and what you get
Low tier, around $150 to $250: steel case, mineral glass, crude bezel, printed dial. Mid tier, around $300 to $500: better case shaping, sapphire, decent bracelet, clone 2824. Top tier, around $500 to $800: titanium case option, sharper engraving, AR coating, reliable movement, better dial gradient. Above that, you are paying for marginal gains and marketing.
QC checklist before you buy
- Ask for a video with the bezel turning and the crown operating.
- Check date alignment at 6 and dial index alignment.
- Confirm the caseback engraving depth and text.
- Ask for a timegrapher reading. Around ±10 seconds per day is acceptable for the price. ±25 seconds per day is not.
- Confirm lug width, likely 22 mm, and whether a strap or bracelet is included.
- Verify water resistance with a local watchmaker, not the seller.
Bottom line
The best Ultra Deep replica is the one that nails the silhouette and dial first, then the movement. It is a costume piece for people who like the look of a 6,000 m Omega. Buy from a seller who shows real photos, answers spec questions, and does not pretend it is a dive instrument.