Certified to ISO 6425. Charged by daylight.

Most watches sold as divers carry a water-resistance number and nothing else. ISO 6425 is different. It is a published standard for diver’s watches that covers the rotating bezel, legibility in the dark, resistance to shock and magnetism, and pressure testing beyond the printed depth.

Citizen builds the BN0150-28E to that standard and says so on the dial, where the text reads DIVER’S 200m. That wording is regulated. A watch that only says 200m has not necessarily been through the same process.

The case is 44mm across and 11.6mm thick, which is a large footprint but a fairly flat one. Citizen ships this reference on a black polyurethane strap with a steel buckle, not a bracelet, and the lugs take a standard 20mm strap if you want to change it.

The crown screws down, the caseback screws down, and the bezel turns one way only, so an accidental knock can only shorten a timed interval rather than extend it. Every figure here comes from Citizen’s published specification, not from measuring a unit ourselves.