Citizen Promaster Dive 200m 42mm Automatic Watch #NB6025-59H

Model Reference: NB6025-59H

Overview
The NB6025-59H is a high-tech reimagining of Citizen’s heritage, combining a vintage 1970s silhouette with the brand’s most durable modern materials. It is a "true" diver, built to ISO 6425 standards, but executed in Black DLC (Diamond-Like Carbon) Super Titanium. This makes the watch incredibly light (just 111g) and virtually scratch-proof. The graduated grey dial (fading from light to dark) gives it a moody, sophisticated look that separates it from the standard blue or black versions of the Fujitsubo.

Technical Specifications

Case Size: 41mm (Classical, wearable diameter with a 12.3mm thickness)

Case Material: Super Titanium™ with Duratect DLC coating

Movement: Caliber 9051 (Automatic; high-beat 28,800 vph with 42-hour power reserve)

Crystal Type: Sapphire Crystal (Flat with a retro-style beveled edge)

Water Resistance: 200 Meters (20 ATM / 660 feet) — ISO 6425 Certified

Dial: Fumé (graduated) grey dial with high-intensity luminous baton indices

Bezel: Unidirectional rotating elapsed-time bezel with a DLC titanium insert

Strap: Super Titanium™ bracelet with DLC coating and a fold-over safety clasp

Special Features

Legacy of the "Barnacle": This watch is part of the lineage inspired by the 1977 Challenge Diver. It retains the iconic retro hands and square markers but upgrades the internal tech for modern reliability.

DLC Surface Hardening: The Diamond-Like Carbon finish is Citizen's toughest coating. It’s not just black paint; it’s a carbon-based layer that makes the titanium 5x harder than stainless steel, specifically designed to resist the "desk diving" scuffs of daily life.

Magnetic Resistance (16,000 A/m): The 9051 movement is heavily shielded. It can withstand magnetic fields from smartphones and tablets at a distance of just 1cm without losing its mechanical accuracy.

Super Titanium Comfort: Because it’s titanium, the watch feels like it "disappears" on the wrist. At 111g, it’s significantly lighter than a standard steel diver, making it an ideal candidate for all-day wear.

Vintage-Inspired Sapphire: The crystal is flat on top but features a high-relief beveled edge that mimics the look of old-school acrylic crystals, but with the total scratch resistance of sapphire.

Green Super-LumiNova: The lume is applied heavily to the hands and markers, glowing a bright, long-lasting green that provides a sharp contrast against the dark grey-to-black dial.

Diving Extension: The bracelet clasp includes a tool-less extension, allowing the watch to be quickly adjusted to fit over a wetsuit or to provide extra breathing room on a hot day.