The short answer
A replica Omega Planet Ocean Ultra Deep 6000M copies the shape, dial and wrist presence of Omega's 45.5mm titanium dive watch. It does not copy the 6000m depth rating, the Grade 5 titanium case, or the Master Chronometer movement. Most versions run a stainless steel case with a decorated clone movement and a ceramic or coated bezel insert. They look convincing on a wrist and in photos. Treat the "6000M" printed on the dial as artwork, not a specification. Do not dive with one, and do not swim in one if you care about the movement.
What the real Ultra Deep actually is
Omega built the Planet Ocean Ultra Deep 6000M around a 45.5mm Grade 5 titanium case, a domed sapphire crystal that is unusually thick, and a caseback with deep engraving. The lugs are the giveaway detail: Omega uses its manta lug system, where the strap attaches to bars that fold into the case rather than traditional spring bars between two horns. The dial is a gradient ceramic with broad arrow hands and a date at 3. Inside sits a Master Chronometer calibre rated to 15,000 gauss and certified to run within 0/+5 seconds a day.
Where a good replica gets close
The silhouette reads correctly at arm's length. The gradient dial, the broad arrow hands, the crown guards and the bezel insert markings are all reproduced well at the better tiers. A first copy version on a rubber strap will fool most people who are not holding the real thing next to it. Case diameter is usually in the right range, so it wears the same oversized way on the wrist.
Where it falls short
- Metal and weight. Grade 5 titanium is light and slightly warm grey. Stainless steel copies feel noticeably heavier and colder in tone.
- The manta lugs. This is the hardest part to fake. Plenty of replicas quietly fall back on standard spring bars and lugs, which changes how the strap sits.
- Crystal. The real sapphire is thick and deeply domed. Copies often use a thinner crystal with weaker anti reflective coating, so you get glare and a distorted edge.
- Bezel action. A genuine dive bezel clicks cleanly through 120 positions and lines up dead on 12. Replica bezels can feel mushy and sit half a degree off.
- Movement. The clone inside is decorative. Beat rate, winding feel, date snap and long term accuracy are all a step down, and there is no chronometer certification.
- Water resistance. Realistically 30m to 50m at best on a well sealed copy, and less on a cheap one. The crown threads and gaskets are the weak point.
The 6000M number means nothing on a copy
Depth ratings are not cosmetic. ISO 6425 exists precisely because a dive watch has to be tested watch by watch under pressure, with checks for condensation, legibility in the dark and bezel security. A replica factory is not pressure testing each unit, and no replica is going near 6000m. If you need a watch for water, buy a cheap actual diver instead. Keep the Ultra Deep copy for dry land.
What I check before buying one
- Measure the case and thickness. If the seller quotes numbers, verify against the real spec.
- Look at the lug area and ask how the strap attaches. If it uses plain spring bars, it is not a manta lug build.
- Check bezel alignment at 12 under a lamp, then rotate it and listen for even clicks.
- Inspect dial printing and the date window with a loupe. Blurry text is the first thing that gives a copy away in person.
- Wind and set the movement. The stem should feel tight, and the date should snap rather than crawl.
- Ask about lume. Weak or patchy lume is common, and it is visible in daylight on the dial markers.
Price tiers, roughly
Cheap copies under the first copy range look fine in a listing photo and poor in hand: wrong metal, printed dial, rough bezel. The mid and first copy tiers spend their money on the case finishing, the dial gradient, the crystal and a better movement, which is where the money should go. Above that you are paying for marginal gains, and you are still not buying a collectible. A replica has no resale value and no service history.
Bottom line
Buy a replica Omega Planet Ocean Ultra Deep 6000M because you like the design and want the look for a fraction of the price. Check the lugs, the bezel alignment, the crystal and the movement before you commit. Then keep it away from the water, because the only thing on that dial rated to 6000m is the paint.