Citizen Promaster Diver Automatic

The naming can be confusing, but Citizen makes distinct lines: standard Promaster Divers are powered by their proprietary Eco-Drive solar technology, while others use a mechanical automatic movement, such as the Miyota caliber. The Eco-Drive models charge via sunlight or artificial light and do not require battery changes. An automatic Promaster, on the other hand, self-winds through the motion of your wrist.

Yes, the Citizen Promaster Diver series is built specifically for scuba diving and typically carries an ISO 6425 certification for professional dive watches. They feature a minimum water resistance of 200 meters and a unidirectional rotating bezel to track elapsed dive time. You should avoid pressing the buttons underwater unless specifically stated in the manual.

Most modern Citizen Promaster Diver watches feature a highly scratch-resistant sapphire crystal to protect the dial. Some older or entry-level models might use mineral crystal, so it is always best to check the specific reference number. The sapphire crystal ensures that the watch face remains clear and legible even in harsh underwater conditions.

If it is an Eco-Drive model, the watch typically features a power reserve that lasts anywhere from six months to a full year on a single full charge in the dark. For the automatic versions, the power reserve usually lasts around 40 to 42 hours when fully wound. Keeping the watch exposed to light or wearing it daily prevents it from stopping.