There’s something magical about a watch dial that lights up the dark. For many enthusiasts lume isn’t just about function, but also about the eye-catching effect. And with the ØSTERSØEN Fuldmåne, Nordic Marine Instruments has created a piece that takes that fascination one step further: a full-lume dial that transforms as the day turns to night.
Built Like a True Tool Watch
Toolish yet elegant: Nordic Marine Instruments – Østersøen – Fuldmåne (wrist circumference: 18cm / 7″)
At 40mm in diameter and 11.9mm slim, the Fuldmåne wears comfortably on almost any wrist. It’s crafted from 316L marine-grade stainless steel, features a screw-down crown, sapphire crystal with AR coating, and is water-resistant to 200 meters. In other words, it’s as practical in the water as it is on land.
The watch is crafted from brushed stainless steel with carefully applied MØRK finishing (black-polished)
The bezel operates with a crisp 120 clicks, the kind of detail that collectors appreciate. And the subtle black-polishing finish, called MØRK, adds depth and refinement without losing the tool-watch vibe.
The Allure of a Full Lume Dial
This stunning full lume dial creates the serene brilliance of a clear night, glowing with vintage-inspired BGW9-Super-LumiNova®
A dive watch with good lume is expected. But a dial that is entirely luminous? That’s something special. Coated in Super-LumiNova® BGW9, the Fuldmåne charges in daylight and radiates after dark, giving the wrist an almost ethereal glow. The hands and markers shine in blue, contrasting against the green-tinged dial. A clever detail that keeps legibility clear, even in pitch-black conditions.
Its clean, date-free dial preserves the purity of the design, while slim, diamond-cut hands and indices the minimalist clarity of the Nordic landscape.
This isn’t just for divers. Whether you’re heading out for a night drive, traveling across time zones, or simply enjoying the glow while relaxing at home, the Fuldmåne makes checking the time an experience.
The Bracelet We All Want
One of the most practical features of the Fuldmåne is its on-the-fly micro-adjust clasp. If you’ve ever worn a watch all day, you know how wrist size changes with heat, cold, or activity. Being able to adjust the bracelet instantly makes a huge difference in comfort, especially when you want to wear the watch over a wetsuit. Add to that the taper from 20mm down to 16mm, and you’ve got a bracelet that feels as good as it looks.
On-the-fly adjustment buckle and quick release spring bars
Why the Fuldmåne Stands Out
For a young brand, Nordic Marine Instruments has shown a real eye for details that matter to enthusiasts: symmetry, functionality, comfort, and build quality. The Fuldmåne isn’t overloaded with gimmicks or unnecessary text on the dial. It’s clean, minimal, and ready for years of daily wear.
It also nods to vintage diver heritage with its lume-forward design, but executes it with modern finishing and proportions. In many ways, it feels like the kind of watch you buy once and keep – not because you “need” it, but because it just works everywhere.
Specifications at a Glance
- Movement: Miyota 90S5 automatic (slim profile)
- Case: 316L stainless steel, Ø 40mm, 11.9mm thick
- Lug-to-lug: 48mm
- Water resistance: 200m / 660ft
- Bezel: 120-click, unidirectional, brushed steel insert
- Crystal: Flat sapphire with AR coating
- Lume: Full dial BGW9 + blue-glowing indices & hands
- Bracelet: 20–16mm taper, solid links, quick-adjust clasp
- Extras: Vegan cork pouch & polishing cloth
Final Thoughts
The ØSTERSØEN Fuldmåne captures what many enthusiasts love about dive watches: toughness, utility, and a little bit of magic when the lights go down. It’s a watch that doesn’t scream for attention but rewards you every time you glance at your wrist.