The number that should sell the DOXA SUB 300 Ti5 isn't the 300 meters or the titanium. It's 45mm.

That's the lug-to-lug measurement on a case that's 42.5mm across, and it explains why DOXA's cushion-shaped SUB wears smaller than its diameter suggests. Most 42mm divers push past 48mm lug-to-lug and start hanging off average wrists. This one doesn't, and in Grade 5 titanium it does that at a fraction of the weight.

Here's what that gets you.

Grade 5 Titanium Comes Back to the Permanent Collection

DOXA has used titanium before, but mostly in limited runs and special editions. The SUB 300 Ti5 makes it a standing part of the catalog: case, screw-down crown, and screw-in caseback all in Grade 5, the alloy that trades pure titanium's softness for meaningfully better strength and hardness.

The architecture is unchanged, which is the point. This is still the SUB 300 shape that traces back to 1967, with the patented unidirectional bezel carrying DOXA's dual scale for depth and dive time based on US Navy no-decompression limits. That bezel is the reason the original mattered, and it's still the clearest expression of DOXA's whole design philosophy, which we covered in more depth in our history of the DOXA brand.

Under the domed "glass box" sapphire, all dive-related indications are lumed, with the oversized orange minute hand doing exactly what DOXA's underwater visibility testing determined it should back in the sixties.

Seven References, Five Names

• Professional (orange) - $3,190

• Sharkhunter (black) - $3,190

• Caribbean (navy blue) - $3,190

• Redcoral (red, and a black variant) - $3,190

• Whitepearl (white, and a black variant) - $3,290

All seven ship on woven-texture Dive Flex rubber straps with a Grade 5 titanium pin buckle, color-matched per reference. Additional straps run $180, or $330 with a buckle included.

The movement is a COSC-certified Swiss automatic at 4Hz with roughly 38 hours of power reserve, a proven, widely serviceable architecture of the kind that keeps tool watches running and repairable for decades.

The Whitepearl Dials Are the Real Story

The two Whitepearl references are where this collection actually gets interesting, and they're the reason to read past the material change.

Both carry dials coated entirely in Super-LumiNova. Not lumed markers on a painted dial, the whole surface. As light drops, the dial stops being a background and becomes the light source, with the hands and markers reading as silhouettes against it. It inverts how a dive watch normally behaves in the dark.

There's a functional argument buried in that, and it's very DOXA. The brand's original 1967 dial testing was about legibility in murky water, which is what produced the orange dial in the first place. A fully luminous surface is the same problem approached from a different direction: maximize contrast when visibility drops. Whether it outperforms a conventional lumed dial in practice is worth judging in person, but it isn't decoration for its own sake.

DOXA offers it in two configurations, a white dial and a black one, both at $3,290. That's a $100 premium over the rest of the collection, which is modest for what's a genuinely different watch at night.

What You're Actually Paying For

DOXA's appeal has always been the shape, the bezel, the orange, and the fact that the brand has a documented history on real seabed missions rather than a marketing department's version of one.

The titanium construction is a genuine functional upgrade for a dive watch: lighter on the wrist through a long day, and better corrosion resistance in salt water than steel. Paired with a 45mm lug-to-lug, this is one of the more wearable serious divers you can buy, and comfort is the thing you notice every day.

There's no real substitute for a SUB 300, which has always been the brand's advantage. This is the most comfortable version DOXA currently makes, and in the Whitepearl configuration, the most distinctive.

For anyone still deciding where a SUB fits in a collection, Watch Gang's dive watch collection covers the category at several price points.