The IWC Aquatimer Deep Two and Deep Three are the only series-produced mechanical dive watches with a built-in depth gauge that also records your maximum depth. That gauge, not the case or the dial, is the part counterfeiters cannot copy cheaply, which is why convincing fakes of these two references are far rarer than fake Submariners. Searches for "Aquatimer Deep Time" almost always mean the Deep Two (reference IW3547) or the Deep Three (reference IW3557).
What is the IWC Aquatimer Deep Two?
IWC launched the Deep Two in 2009 as a 46 mm titanium diver rated to 120 m. Its headline feature is a mechanical depth gauge that reads to 50 m. A central hand tracks your current depth, and a second hand is pushed along the scale to mark the deepest point of the dive until you reset it.
What is the IWC Aquatimer Deep Three?
The Deep Three followed in 2014 with a cleaner dial layout, a rated depth of 100 m, and the same 50 m gauge range. Inside is the calibre 30120 with roughly a 42-hour power reserve. Both models use titanium cases and an inner dive bezel turned by a second crown.
How does the mechanical depth gauge work?
A water inlet in the case feeds pressure to a sealed membrane, and the membrane movement is transferred through a linkage to the hands on the dial. The system is purely mechanical, with no battery and no sensor. It also adds a stack of extra seals and precision parts, which is exactly why it is hard to fake.
Why are replicas of these models rare?
Counterfeit factories copy what sells in volume: Submariner, Speedmaster, Santos. The Aquatimer Deep is a low-volume niche model, and its selling point is the one feature that takes real engineering to reproduce. A functional depth gauge needs a sealed pressure path, a calibrated linkage, and a working reset, so most fakes simply skip it.
How can you tell a counterfeit Aquatimer Deep?
- Dead gauge: on a fake the depth hand is usually fixed or swings loosely and never responds to pressure.
- Weight: genuine cases are titanium and feel light for their size. Many fakes use steel and feel noticeably heavy.
- Second crown: on a real watch it turns the inner bezel with firm, even clicks. On a fake it often spins or does nothing.
- Case back: reference numbers, engraving depth, and font should be crisp and centered.
- Crystal: genuine sapphire has an anti-reflective coating on both sides, so the dial stays readable at an angle.
- Lume: plots should be evenly filled and glow uniformly, not patchy or greenish under room light.
Is there a legitimate alternative with a depth gauge?
The Oris Aquis Depth Gauge uses a channel cut into the sapphire crystal to read depth and sells for a fraction of a used Deep Two. IWC's own Aquatimer Automatic 2000 is the simpler and cheaper route into the same family. If you want the real gauge, buy the real watch, because the function is the whole point of the model.