Undone Aquadeep K9 Crystal Watch Black

UNDONE Aquadeep K9 Crystal Watch

The World's First Fully Transparent Dive Watch Built from Optical K9 Crystal

The UNDONE Aquadeep K9 Crystal features a fully transparent K9 crystal case that lets you see every gear, every bridge, and every beat of its automatic movement from any angle. Aquadeep K9 is designed to redefine traditional non-transparent diving watch structures by replacing opaque metal with optical-grade K9 crystal across the case, bezel, and caseback. With a 300M water resistance rating and a skeleton dial that hides nothing, this dive watch transforms what you expect from a timepiece built for the water.

Why You'll Love It

• Complete 360° Mechanical Visibility – The visibility of the automatic movement is emphasized by the transparent case, giving you an unobstructed view of the NH70 silver automatic movement from literally every angle. No detail is hidden.

• 300M Water Resistance – Engineered transparency meets serious water resistance. This Aquadeep K9 Crystal is rated for 300 meters, so you wear it with confidence whether you're on deck or underwater.

• Six Precision-Cut Crystal Stones – The watch features six precision-cut crystal stones for light reflection, set directly into the skeleton dial to capture and scatter light with every wrist movement.

• Skeletonized Dial Design – The Aquadeep K9 offers a skeleton watch design showcasing mechanical movements. Every rotation, every oscillation becomes part of the experience.

• Super-LumiNova Hands for Any Condition – Silver-tone hands filled with Super-LumiNova ensure great legibility in total darkness or bright daylight, a zero compromise approach to visibility.

What Makes It Different

Most dive watches hide their mechanics behind solid steel or titanium cases. You trust they work, but you never actually see them work.

The UNDONE Aquadeep K9 Crystal is built differently:

• Full K9 Optical Crystal Construction – The case, bezel, and caseback are all crafted from optical-grade K9 crystal, offering a level of engineered transparency no conventional dive watch can match. The Aquadeep K9 emphasizes industrial aesthetics through uncompromised transparency.

• Seiko NH70 Silver Automatic Movement – Specifically chosen for its visual appeal, this skeletonized movement in silver finish turns the interior into a display of mechanical artistry. The automatic movement visible through every surface makes the case for beauty in engineering.

• Art Meets Specification – Where other transparent watches sacrifice capability, the Aquadeep K9 Crystal pairs its crystal construction with a 300M water resistance rating. It's a dive watch that doesn't ask you to choose between form and function.

How It Works

1. Unbox and Choose Your Strap Each order includes an FKM rubber strap plus an extra rubber strap in your choice of color. Attach the 22mm strap and you're ready.

2. Wind and Wear The NH70 automatic movement self-winds with your natural motion. No battery, no fuss. Simply wear it and the movement comes alive - every gear turning in full view through the K9 crystal case.

3. Experience the Display From a boardroom to a night out, the continuous display of horological craftsmanship draws attention. Light passes through the transparent case, hits the six crystal stones, and creates a visual effect that no solid-case watch can replicate. The watch appeals to enthusiasts who appreciate mechanical structure displays.

Product Details

• Case Material: Optical-grade K9 crystal (case, bezel, caseback)

• Case Diameter: 43mm with a 22mm lug width

• Movement: Seiko/TMI NH70 silver automatic movement (skeletonized)

• Water Resistance: 300 meters (30 ATM)

• Dial Crystal: Sapphire crystal over dial face

• Hands: Silver-tone with Super-LumiNova

• Dial Accents: Six precision-cut SZ crystal stones

• Strap: Rubber strap 22mm

• Warranty: The Aquadeep K9 has a 1-year warranty. Warranty starts from the date of shipment. Official warranty coverage is emphasized by Bang On.

Who It's For

Ideal for:

• Watch collectors seeking innovative horological design and transparency that goes beyond a simple exhibition caseback

• Diving enthusiasts who want professional water resistance specs paired with artistic crystal craftsmanship

• Design-conscious professionals who appreciate the bio of a mechanical movement told through a fully transparent case

• Urban creatives looking for a conversation-starting timepiece from the UNDONE collection

• Gift buyers searching for a statement piece that combines technical excellence with visual innovation - see more ideas in our gift picks

If you value a watch that reveals rather than conceals, the Aquadeep K9 Crystal fits your needs.

Frequently Asked Questions

Is the K9 crystal durable enough for daily wear? Yes. Optical-grade K9 crystal offers high clarity and solid hardness. While it differs from sapphire (which covers the dial), the K9 crystal body is built to handle daily wear. Treat it with the same respect you'd give any premium timepiece - avoid hard impacts on sharp surfaces.

How does water resistance work with a transparent case? The Aquadeep K9 Crystal achieves its 300M water resistance rating through precision-engineered sealing between crystal components. The transparency is a design choice; the sealing technology is what delivers the water resistance.

Does the transparent design affect the movement? Not at all. The Seiko NH70 automatic movement operates identically whether enclosed in metal or crystal. The difference is that you literally see it working - every bridge, every gear, every oscillation is on full display.

What's included with purchase? You receive the Aquadeep K9 Crystal watch with Full 1-year warranty coverage from the date of shipment is included.

Is this an authentic UNDONE watch? Absolutely. Bang On is an authorized dealer. Every UNDONE Aquadeep purchase through our store comes with official warranty coverage and guaranteed authenticity. You might also explore the UNDONE Aquadeep Signal Black or the Undone AquaLume for other options in the lineup.

Ready to Experience Horological Innovation?

Stop settling for dive watches that hide their best work behind solid walls of steel. The UNDONE Aquadeep K9 Crystal delivers zero compromise - full transparency, 300M water resistance, and a skeleton design that turns every mechanical detail into a visual experience.

Choose the Aquadeep K9 and order a timepiece that's as great to look through as it is to look at.

Secure checkout. International shipping. Full warranty coverage through Bang On.

Pre-order : Delivery from late July