The helium escape valve on a replica Rolex Deepsea 136660 sits on the left flank of the case at 9 o'clock and is meant to release helium gas that seeps into the watch during saturation diving. On the genuine Deepsea the valve opens on its own as internal pressure climbs past a set point. On most replica Deepsea 136660 watches the valve is a decorative crown that unscrews but vents nothing, which makes the feature visual rather than functional.
fake rolex deepsea 136660 watch
That gap matters if you plan to dive with the watch. It matters far less if you wear it on land, where helium never enters the case.
Rolex Deepsea 136660 Replica Comparison: Budget vs Mid-Tier vs 1:1 Clone
What Does the Helium Escape Valve Do?
Helium atoms are small enough to pass through the case gaskets of a dive watch. In a saturation chamber the gas around the diver is helium mixed with oxygen, so it works its way inside over hours or days.
When the diver returns to the surface, the gas inside has no fast way out. Trapped pressure can pop the crystal off the case. The valve gives that gas a one-way exit.
How Much Does a Rolex Deepsea 136660 Replica Cost?
- Genuine Deepsea 136660: automatic valve, no manual step needed.
- Sea-Dweller 126600: same idea, valve at 9 o'clock.
- Most replicas: a screw-down cap or a fixed cosmetic crown.
- Dive computers: solve the same problem in software with a sealed case.
Rolex Deepsea 136660 Specs at a Glance
The 136660 is the current Deepsea generation. It replaced the 126660 with a thinner crystal, a wider date window, and dial updates.
- Case size: 44 mm wide, about 17.7 mm thick.
- Water resistance: 3,900 m / 12,800 ft.
- Bezel: 60-minute unidirectional Cerachrom in black ceramic.
- Case back: titanium, to carry the pressure load.
- Movement: Caliber 3235, 70-hour power reserve.
- Bracelet: Oyster with Glidelock and Fliplock extension.
- Lume: Chromalight blue on hands and markers.
The Ringlock System does the heavy lifting on pressure resistance. A nitrogen-alloyed steel ring inside the case supports the crystal from behind.
How to Check the Helium Escape Valve on a Replica
Ask the seller for close-up photos of the 9 o'clock side before you pay. A few checks take seconds.
- Look for a crown or cap at 9 o'clock. If the case flank is smooth, the replica skipped the valve.
- Check that the valve sits flush with the case. A part that sticks out or sits crooked shows poor machining.
- Ask if the valve unscrews. Most sellers will say it is decorative, which is normal at this price tier.
- Compare the valve size to photos of the genuine watch. Replicas often make it too large or too shallow.
- Check the engraving. Genuine valves carry crisp text; cheap copies have soft or missing marks.
Replica Quality Tiers for the Deepsea 136660
Replica Deepsea watches come in three rough tiers, and the helium escape valve is one of the easiest ways to tell them apart.
- Entry tier: stamped case, mineral glass, valve shaped into the case line. Skip these.
- Mid tier: 316L steel, sapphire crystal, working bezel, cosmetic valve.
- Top tier: 904L or 316L steel, ceramic bezel insert, a separate valve part with correct proportions, clone 3235 movement.
Top-tier builds cost the most and hold up best. The valve on a replica Rolex Deepsea 136660 with helium escape valve styling is still not a pressure relief device, but it looks right from arm's length and even in the hand.
What Movement Sits Inside?
Asia 3235 Clone
Most high-grade replica Deepsea 136660 watches use a clone of the Rolex 3235. It runs at 28,800 vph and offers a long power reserve. The sweep is smooth and the date changes near midnight.
Decorated ETA or Seiko Base
Some builders drop in an ETA 2824 clone or a Seiko NH series and plate it to look like a 3235. These cost less and are easier to service, but the rotor and bridges never match the real thing under a loupe.
Water Resistance: What a Replica Can and Cannot Do
A replica Deepsea 136660 will not survive 3,900 m, and no seller can prove that it will. Gaskets, case threads, and crystal seating decide the real depth rating, and those vary from batch to batch.
Most reps handle rain, hand washing, and a pool swim. Salt water and pressure washing are risky. If you plan to dive, use a dive computer and leave the watch on the boat.
You can have a watchmaker pressure test the case. A dry test to 5 or 10 bar tells you more than any listing photo.
Common Flaws to Spot on a Fake Deepsea 136660
- Date font too thin or off-center in the window.
- Bezel insert numbers that fade or sit shallow.
- Cyclops with weak magnification or no blue anti-reflective tint.
- Bracelet end links that rattle or leave gaps at the lugs.
- Valve placed too high or too low on the case flank.
- Case back engraving that is laser-etched rather than deep-stamped.
Frequently Asked Questions
Does the helium escape valve on a replica Deepsea 136660 work?
In most cases, no. The part unscrews or sits fixed, and there is no spring or one-way membrane behind it. Treat it as a design detail, not a safety feature.
How thick is a replica Deepsea 136660?
Good replicas land near the genuine 17.7 mm. Cheap ones run thin because the case is milled from a smaller blank, which throws off the profile on the wrist.
Can I swim with a replica Deepsea 136660?
Pool swimming is fine if the case passes a pressure test. Avoid deep dives, high-pressure showers, and hot tubs, since heat stresses the gaskets.
Why does the Deepsea need a valve when the Submariner does not?
The Submariner is rated to 300 m and is not built for saturation diving. The Deepsea is, and saturation divers live in a helium-rich habitat for days at a time.
Caring for a Deepsea 136660 Replica
- Rinse the case in fresh water after contact with salt or chlorine.
- Check the crown and valve threads for grit before you screw them down.
- Have gaskets replaced every year or two if you swim with the watch.
- Keep it away from strong magnets, which can pull a clone movement out of beat.
- Store it in a dry case, not a humid bathroom drawer.
One last note: check the rules where you live. Selling or buying a counterfeit watch carries legal risk in many countries, and customs can seize a package at the border.