The Citizen Promaster BN1024-01E is a black-dial, light-powered Professional Diver 300m with Citizen’s E365 movement. Its headline specifications include 300m saturation-diving water resistance, a helium escape valve, and about one year of operation on a full charge. It is also a large watch: the case measures 46.0mm across and 16.3mm thick. The details below are Citizen’s published specifications, not results from an independent wear, timing, or dive test.
What is the Citizen BN1024-01E?
Citizen identifies the BN1024-01E as a Promaster Marine Eco-Drive Professional Diver 300m. It uses caliber E365, which is powered by light, and has a black dial with a date display. The case is stainless steel, and the crystal is sapphire with an anti-reflective coating, according to Citizen Japan’s product specifications.
What are the BN1024-01E’s specifications?
| Specification | Citizen’s published information |
|---|---|
| Movement and power | Caliber E365; light-powered Eco-Drive |
| Operation when fully charged | Approximately one year, according to Citizen |
| Accuracy | ±15 seconds per month on the Japan specification page |
| Water resistance and diving features | 300m saturation-diving water resistance; helium escape valve |
| Case | Stainless steel; 46.0mm wide, excluding crown and crown guard; 16.3mm thick |
| Weight | 143g on the Japan listing |
| Crystal | Sapphire with anti-reflective coating |
| Strap | Biomass urethane made with BENEBiOL; listed adjustable range 138–216mm |
| Other specified features | One-way rotating bezel, screw-lock crown, luminous hands and indices, date display, charge warning, overcharge prevention, quick-start function |
| Included fit accessory | Extension band |
These are manufacturer specifications. They do not establish how the watch feels on a particular wrist, how its bezel or lume performs in use, or how accurately a particular example keeps time.
How long does the Citizen E365 run on a full charge?
Citizen states that a full charge provides approximately one year of operation, including when the watch is left in darkness after charging. The Japan product page gives the movement’s accuracy as ±15 seconds per month. Both are manufacturer figures rather than independent timing results. Because Eco-Drive depends on light, consult the official product information and operating guidance for charging and charge-warning details before relying on the watch.
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- Day / Date, 3 Hand, Automatic
- Silver-Tone Stainless Steel Case
- Dual Spherical Mineral Crystal
- 200M Water Resistant
Is the BN1024-01E a 300m saturation diver?
Citizen specifies 300m saturation-diving water resistance and lists a helium escape valve, screw-lock crown, and one-way rotating bezel. Citizen Europe describes the model as ISO-compliant on its regional product page. These are Citizen’s stated specifications and claims; the listed depth rating alone does not determine whether a watch is suitable for a particular dive or replace dive-planning guidance.
How big is the BN1024-01E?
The case is 46.0mm wide, measured without the crown and crown guard, and 16.3mm thick. Citizen Japan lists its weight as 143g. Those figures point to a substantial watch on paper, but wrist presence and comfort depend on the wearer and cannot be established from dimensions alone.
Rank #2
- Modern, pilot-inspired Promaster timepieces equipped for professional use to discover the world from high above.
- Synchronized to Atomic Time Clock for Superior Accuracy, Atomic Timekeeping Technology with Synchronized Time Adjustment Available in 24 Time Zones, 1 Second Chronograph Measures up to 60 Minutes, Perpetual Calendar, 12/24 Hour Time, Alarm, Power Reserve Indicator, Day / Date
- Black Stainless Steel
- Sapphire Crystal
- 200 Meters Water Resistant and 5 Year Limited Warranty
The official adjustable strap range is 138–216mm, and an extension band is supplied. That may be useful when fitting the watch over exposure gear. The cited specifications do not establish compatibility with third-party straps.
What is the difference between BN1024-01E and BN1024-01Z?
The BN1024-01E has a black dial; the BN1024-01Z is the red-dial sibling. Citizen’s Japan product page lists both references, and its launch announcement gives them the same movement and core specifications. The supported distinction is dial color; check the local listing for availability and price rather than assuming the Japanese launch price applies elsewhere.
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Rank #3
- Men's luxury timepieces with technical advancements and a sporty style
- 3 Hand, Date
- Silver-Tone Stainless Steel
- Mineral Crystal
- 100 Meters Water Resistance and 5 Year Limited Warranty
Japan launch price and availability context
Citizen’s launch announcement, dated February 21, 2025, gave a planned Japanese release date of April 10, 2025, and a planned list price of ¥121,000 including tax (¥110,000 before tax). Citizen Japan’s product page displays ¥121,000 including tax. These are Japan-specific figures, not a current global street price. The cited sources do not establish present stock or pricing outside Japan.
Sources: Citizen Japan product page; Citizen Japan launch announcement; Citizen global Promaster overview; Citizen Europe product page.
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Rank #4
- Men's luxury timepieces with technical advancements and a sporty style
- 1/5 Second Chronograph Measures up to 60 Minutes, 12/24 Hour Time, Date
- Silver-Tone Stainless Steel 42mm Case
- Luminous Hands and Markers and Mineral Crystal
- 100 Meters Water Resistant and 5 Year Limited Warranty
Product prices and availability are accurate as of the date/time indicated and are subject to change. Any price and availability information displayed on Amazon at the time of purchase will apply.
