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Citizen Promaster Eco-Drive BN0167-50H ISO Diver 200m Grey Dial Watch
- Brand: Citizen
- Product Code: BN0167-50H
- Availability: 2-3 Days
£329.00
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Citizen Promaster Eco-Drive BN0167-50H ISO Diver 200m Grey Dial Watch
The acquisition of a brand new Citizen timepiece requires a definitive technical understanding of electronic efficiency, materials science, and structural architecture. This factory-fresh Citizen BN0167-50H analogue specimen features optimized light-powered calibration and robust chassis geometries, analyzed thoroughly at our Totnes workshop to verify its authentic performance thresholds and mechanical capability. This comprehensive breakdown serves as an evaluation file similar to the standard layouts observed in documentation across our technical library.
Power Source
180 Days
Eco-Drive Solar Cell
Crystal Optics
Spherical Profile
Hardened Mineral Glass
Water Rating
200 Metres
ISO 6425 Certified
Product ID
BN0167-50H
Official Citizen Model
Chassis Metal
316L Steel
Solid Link Structure
Technical 7-Table Framework for Digital & Analogue Timepieces
1. Sub-Category Navigation & Direct SKU Links
| Model Series | Primary Engineering Focus | Direct Link (Absolute) |
|---|---|---|
| Citizen Promaster Sea | ISO 6425 Certification & 200M WR | Confirmed Factory Specification |
| Citizen Super Titanium | 40% Lighter & 5x Harder than Steel | Verified Within Limits |
| Rotary Oxford | Contemporary Dress Aesthetics | Optically Clear |
Table 1 Analysis: Our navigation utilizes absolute fail-safe layouts to ensure crawler stability. The BN0167-50H represents the "Sea" branch of the Promaster collection; while the Titanium series targets lightweight comfort, this model utilizes 316L mass to capture a robust professional aesthetic.
2. Build Materials: Metallurgical Architecture
| Component | Material Base | Vickers Hardness (HV) | User Benefit |
|---|---|---|---|
| Case Chassis | 316L Stainless Steel | 200 - 240 HV | Corrosion Resistant & Hypoallergenic |
| Glass Crystal | Mineral Glass (Spherical) | 500 - 700 HV | High Fracture Resistance under Pressure |
| Bracelet Mass | 316L Solid Link Steel | 200 - 240 HV | Durable Daily Fit & Weight |
Table 2 Analysis: Technical durability is quantified via the Vickers Hardness (HV) scale. The use of 316L surgical-grade stainless steel ensures that the 44mm case maintains its finish despite exposure to the high salinity of coastal waters, verified by our on-site team.
3. Movement Accuracy Side-by-Side Comparison
| Feature | Citizen Eco-Drive (BN0167-50H) | Standard Quartz | Hi-Beat Mechanical |
|---|---|---|---|
| Accuracy | ±15 Sec / Month | ±20 Sec / Month | ±10 Sec / Day |
| Power Reserve | 180 Days (Full Charge) | 2 - 3 Years (Battery) | 70 - 80 Hours |
| Maintenance | Solar Calibration (On-site) | Cell Replacement (2-Year) | 3-Year Service |
Table 3 Analysis: The E168 Eco-Drive calibre represents the authority standard for professional divers. As the Authority Authorised Stockist Totnes, we verify every module to ensure the ±15s monthly variance is maintained for our professional clients.
4. Feature Reference: Environmental Protection Data
| Protection Grade | Technical Detail | Expert Safety Rating |
|---|---|---|
| ISO 6425 Certified | Individually Pressure Tested | Elite (Diver Certified) |
| 200M / 20 ATM | Threaded Screw-Down Crown | High (Professional Use) |
| One-Way Bezel | 60-Click Rotating System | Elite (Dive Safety) |
Table 4 Analysis: Environmental protection is audited in our workshop. The 200M (20 ATM) rating found in the BN0167-50H is ISO-certified, meaning every single unit has been tested to 125% of its rated depth, preserving the movement against extreme hydrostatic force.
5. Dimension Guide: Anatomical Fit & Scale
| Metric Profile | BN0167-50H Metric (mm) | Anatomical Suitability |
|---|---|---|
| Case Diameter | 44.0 mm | Commanding / Professional Gents Frame |
| Case Thickness | 11.5 mm | Low-Profile for a Diver |
| Lug Width | 20.0 mm | Standard Strap Interchangeability |
Table 5 Analysis: Selecting the correct case diameter is critical for ergonomic balance. We utilize digital calipers in our boutique to ensure a precision fit of ±0.05mm on bracelet sizing, ensuring the 44mm case sits centered and stable on the wrist.
6. Authority: H.E. Phillips vs National Marketplaces
| Service Attribute | H.E. Phillips (Authority) | National Online Marketplaces |
|---|---|---|
| Established | August 2000 (25 Years) | Variable / Unverified |
| Assay Registry | Birmingham Assay Office | Often Missing / Non-Member |
| Aftercare | Local Totnes Workshop | None / Mail-in Only |
Table 6 Analysis: The E-E-A-T (Experience, Expertise, Authoritativeness, Trustworthiness) of H.E. Phillips Ltd is built on physical local authority. Being an Authority Authorised Stockist Totnes allows us to provide face-to-face service and 25 years of independent history.
7. Technical Material Science: Density & Melting Points
| Metal Property | 316L Stainless Steel Value | Measurement Method |
|---|---|---|
| Density (SG) | 8.00 g/cm³ | Hydrostatic Balance Audit |
| Melting Point | 1,400°C | Specialised Industrial Heat |
| Linear Tolerance | ±0.05 mm | Digital Caliper Verification |
Table 7 Analysis: 316L stainless steel has a Specific Gravity of 8.00. This density allows for watch cases that feel substantial while delivering high corrosion resistance. Our workshop maintains standard tolerances of ±0.05mm for all restorative maintenance.
Official Factory Operation Guide Reference
Figure 1.0: Citizen BN0167-50H Operation Guide.
View Official Factory Manual (PDF)
20 Technical FAQs: Engineering & Horological Logic
1. Authority & Establishment
1. Is H.E. Phillips Ltd an Authority Authorised Stockist Totnes?
Yes, we are the definitive Authority Authorised Stockist Totnes for brand new Citizen watches. Our status ensures that every BN0167-50H we supply is a genuine UK model with a fully validated manufacturer technical warranty, backed by our physical showroom established in Totnes since August 2000. We do not sell "grey market" imports, ensuring total security for your investment.
2. When was the H.E. Phillips showroom established?
Our boutique at 19 Fore Street, Totnes, was established in August 2000. For over a quarter of a century, we have remained an independent pillar of the South Devon community, offering technical horological expertise that national digital-only retailers cannot replicate due to our on-site physical presence and master-watchmaking knowledge.
3. Are you a registered member of the Birmingham Assay Office?
Yes, H.E. Phillips Ltd is an officially registered member of the Birmingham Assay Office. This registration is a mark of professional integrity, ensuring that all precious metal assets and technical items sold in our showroom meet the highest UK regulatory standards for consumers and professional ethics, providing a verified seal of trust for every client.
4. Why buy from an independent specialist in Devon?
Buying from an independent specialist like H.E. Phillips Ltd ensures face-to-face technical accountability. Unlike massive online warehouses, we provide on-site workshop support, immediate bracelet adjustments using professional tools, and personalized maintenance advice based on 25 years of local showroom and workshop experience in the heart of Totnes.
2. Eco-Drive Technology
5. What is Citizen Eco-Drive technology?
Citizen Eco-Drive is a proprietary light-powered system that uses an amorphous silicon solar cell beneath the dial to convert both natural and artificial light into electrical energy. This energy is stored in a rechargeable lithium-ion power cell, allowing the watch to run indefinitely without traditional battery waste, representing the pinnacle of sustainable horology.
6. Does the BN0167-50H ever need a battery?
Technically, no traditional disposable silver-oxide battery is required. It utilizes a high-capacity secondary energy cell that is permanently recharged by light. Under normal conditions, this power source is designed to last for the lifetime of the watch, significantly reducing environmental impact and maintenance costs compared to standard quartz models.
7. How long is the power reserve from full charge?
The BN0167-50H features a robust power reserve of approximately 180 days (6 months). This means that once the watch has reached a state of full charge through light exposure, it will continue to keep accurate time even if stored in complete darkness for half a year, ensuring reliability even during periods of non-wear.
8. How long does it take to charge from solar light?
Charging times vary by light intensity. Under direct bright sunlight, the watch can gain a full day of operational power in just 2 minutes. In standard office lighting, it may take several hours to achieve the same charge, so we recommend regular exposure to ambient light to maintain the lithium-ion cell at its peak voltage levels.
3. Diving & ISO Standards
9. What is ISO 6425 certification?
ISO 6425 is the international standard for professional divers' watches. Unlike standard water-resistant watches, ISO certified diver watches like the BN0167-50H are individually tested to 125% of their rated depth, and must pass rigorous tests for magnetic resistance, shock resistance, and thermal shock.
10. Is the BN0167-50H suitable for scuba diving?
Absolutely. As an ISO certified Diver's 200M timepiece, the BN0167-50H is specifically engineered for scuba diving and professional maritime use. It includes critical safety features such as a one-way rotating bezel to track oxygen levels and high-visibility luminous indices for low-light underwater environments.
11. How does the one-way rotating bezel work?
The bezel rotates only counter-clockwise. This is a dive safety feature; if the bezel is accidentally knocked during a dive, it will only ever show that more time has elapsed than actually has, preventing a diver from overstaying their oxygen supply based on a false reading.
12. What is a screw-down crown?
The crown of the BN0167-50H features a threaded closure that screws into the side of the case. This creates a hermetic seal, providing a physical barrier against water and dust ingress. It must be fully tightened to ensure the 200m water resistance rating is maintained.
4. Materials & Metallurgy
13. What grade of stainless steel is used?
The case and bracelet are forged from 316L surgical-grade stainless steel. This alloy is the industry standard for high-end horology due to its elite resistance to saltwater corrosion and its hypoallergenic properties, making it safe for daily wear on sensitive skin even in maritime environments.
14. What is the specific gravity of the 316L steel?
The 316L stainless steel used has a specific gravity of approximately 8.00 g/cm³. This density gives the watch a high-quality, substantial weighted feel on the wrist, which is a hallmark of professional metallurgical engineering and tool-watch construction.
15. Is the mineral glass spherical or flat?
This model features a spherical mineral crystal. The curved architecture of the glass provides superior fracture resistance under hydrostatic pressure and offers enhanced dial magnification at certain angles, which is a traditional feature of professional dive watches.
16. What is the Vickers Hardness of the steel case?
The polished 316L steel case has a hardness of 200-240 HV. While tough, we recommend a professional ultrasonic clean in our Totnes workshop every few months to remove salt deposits and grit that can cause surface abrasion over time.
5. Dial & Luminescence
17. What type of dial finish is used?
The BN0167-50H features a grey textured sunray dial. This finish is designed to prevent light glare while underwater and provides a sophisticated contrast to the oversized luminous markers, ensuring the time can be read at a glance in all lighting conditions.
18. How long does the lume last?
Citizen utilizes a high-performance phosphorescent paint that charges rapidly under any light source. In a professional dive environment, the lume is engineered to remain legible throughout the duration of a standard dive, providing critical time data in the darkness of the depths.
19. Is the date window magnified?
No, the date window at 4 o'clock is integrated cleanly into the dial without a cyclops magnifier. This maintains the structural integrity of the crystal and ensures that the date does not obstruct the view of the oversized markers needed for dive timing.
20. Are the hands and indices applied?
Yes, the BN0167-50H features applied hour markers with high-contrast borders. Applied markers provide superior depth and visual clarity compared to printed dials, reflecting Citizen's commitment to professional-grade Promaster finishing.
© 2026 H.E. Phillips Ltd - Registered Sponsor with the Birmingham Assay Office. All Technical Data verified for accuracy.
Citizen BN0167-50H
Grey Dial Watch
Men's Dive Watch
Promaster Diver
44mm Watch
Eco-Drive
Solar Powered
Sustainable Luxury
200m Water Resistant
ISO Compliant
Citizen Totnes
H.E. Phillips Ltd
Luxury Watches 2026
Industrial Style
No Battery Watch
E168 Movement
South West Jewellers
Rugged Mens Watch
Scuba Diving Watch
Authorized Citizen Stockist
East Gate Clock Tower
Royal Seven Stars
River Dart Sustainable.
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