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Citizen Eco-Drive AT0200-56L Blue Military Field Chronograph Watch
- Brand: Citizen
- Product Code: AT0200-56L
- Availability: In Stock
£299.00
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Citizen Eco-Drive AT0200-56L Blue Military Field Chronograph 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 AT0200-56L military specimen features light-powered energy capture and standard field geometries, analyzed thoroughly at our Totnes workshop to verify its authentic performance thresholds and structural capability. This comprehensive breakdown serves as an evaluation file similar to the standard layouts observed in documentation across our technical library.
Power Source
150 Days
Eco-Drive Solar Cell
Crystal Optics
Spherical
High Transparency Mineral
Water Rating
100 Metres
10 Bar Hydrostatic Limit
Product ID
AT0200-56L
Official Citizen Model
Total Mass
132.00g
Calibrated Weight
Technical 7-Table Framework for Digital & Analogue Timepieces
1. Electronic Movement & Module Specification
| Component | Technical Core | Verification Parameter | Status |
|---|---|---|---|
| Integrated Circuit | Proprietary Citizen Solar Quartz | Frequency Stability Analysis | Confirmed Factory Specification |
| Oscillator | Quartz Crystal (32,768 Hz) | Monthly Drift Quantification | Verified Within Limits |
| Display Driver | Multi-Hand Chronograph Stepping Motor | Mechanical Alignment Check | Optically Clear |
Table 1 Analysis: The H500 movement features a dedicated light-powered quartz module running on an optimal quartz frequency. This architecture minimizes parasitic power leakage, enabling high-performance chronograph functions without premature voltage drops across the internal micro-circuits.
2. Dimensional & Geometric Layout
| Dimension Metric | Value | Tolerance Range | Ergonomic Stance |
|---|---|---|---|
| Case Diameter | 39.0mm | +/- 0.10mm | Balanced Horizontal Wrist Footprint |
| Lug Width (Transverse) | 20.0mm | Uniform Edge-to-Edge | Mid-Size Profile Suitability |
| Case Thickness (Z-Axis) | 11.0mm | Consistent Center Point | Low-Profile Cuff Integration |
Table 2 Analysis: Micro-caliper measurement confirms an 11.0mm case depth. The dimensional configuration splits physical mass evenly across the 39.0mm plane, ensuring the 132g unit remains centered over the wrist's anatomical pivot point during physical acceleration.
3. Materials Architecture & Physical Hardness
| Chassis Element | Material Foundation | Mechanical Advantage | Structural Focus |
|---|---|---|---|
| Main Case Body | 316L Stainless Steel | Corrosion Resistant & Hypoallergenic | Brushed & Polished Execution |
| Case Back Interface | 316L Stainless Steel | Screw-Down Contact Profile | Moisture Perimeter Guarding |
| Strap Assembly | 316L Solid Link Steel | High Flex-Fatigue Resistance | Ergonomic Wrist Wrapping |
Table 3 Analysis: The 316L surgical-grade stainless steel balances hardness with historic density, exhibiting a Vickers hardness rating of 200 to 240 HV. This ensures that the 39mm case maintains its finish despite daily wear, verified by our on-site team in Totnes.
4. Optoelectronic Crystal Engineering
| Optical Shield | Geometric Profile | Refractive Index | Stress Threshold |
|---|---|---|---|
| Dial Protective Glass | Spherical Mineral Profile | Optimized Transmittance | High Fracture-Shatter Resistance |
| Material Grade | Hardened Mineral Crystal | Mohs Scale: 5.5 - 6.0 | Elastic Flex Under Direct Force |
Table 4 Analysis: The spherical mineral glass geometry introduces a calculated depth across the face. This structural setup helps distribute perpendicular surface forces laterally toward the outer bezel, reducing the risk of a focal-point fracture when the watch face takes an impact.
5. Hydrostatic Sealing & Environmental Rating
| Sealing Zone | Mechanism Type | Pressure Certification | Environmental Envelope |
|---|---|---|---|
| Caseback Interface | Screw-Down Backplate | 100 Metres Static Depth | Swimming / Snorkelling Surface Compliance |
| Setting Crown | Gasket Sealing Shaft | 10 Bar Static Load | Atmospheric Moisture Defense |
Table 5 Analysis: Hydrostatic barrier integrity is achieved using a threaded screw-down steel caseback configuration. This maintains continuous pressure on the elastomer gasket ring, keeping the dry internal module chamber safely isolated from liquid entry up to a static pressure limit of 10 Bar.
6. Metallurgical Backplate & Fastener Integrity
| Metal Component | Alloy Identification | Corrosion Resistance | Biocompatibility Tier |
|---|---|---|---|
| Structural Backplate | 316L Stainless Steel | High Chromium-Nickel Stability | Hypoallergenic Skin Contact |
| Expansion Mechanism | 316L Solid Steel Links | Thread Shear Prevention | High Mechanical Retention |
Table 6 Analysis: The watch uses a 316L steel backplate rather than any precious metals. Because this model contains only this non-precious 316L backplate and steel components, it features no precious metal hallmarks and is accurately described strictly as a high-utility steel analogue chronograph timepiece.
7. Operational Power & Current Drain Analysis
| Power Variable | Battery Chemistry | Nominal Voltage | Calculated Cell Lifespan |
|---|---|---|---|
| Energy Cell | Lithium-Ion Secondary Cell | 1.5 Volts DC | 150 Days Storage (From Full Charge) |
| Lighting Circuit | High-Performance Luminous Paint | Passive Light Storage | Uniform Low-Light Distribution |
Table 7 Analysis: The 150-day power storage threshold relies on a high energy-density lithium-ion secondary cell coupled with an efficient amorphous silicon solar layer beneath the dial. This infrastructure allows for clean, continuous background timekeeping while light vectors constantly replenish storage overhead.
Official Factory Operation Guide Reference
Figure 1.0: Citizen AT0200-56L Operation Guide Diagram.
View Official Factory Manual (PDF)
20 Technical FAQs: Engineering & Horological Logic
1. Brand Heritage & Naming Origins
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, established in Totnes since August 2000. Our showroom at 19 Fore Street presents a quarter-century of independent horological excellence.
2. When was the H.E. Phillips showroom established?
Our showroom at 19 Fore Street, Totnes, was established in August 2000 and has served the South Hams for over a quarter of a century with absolute professional technical oversight.
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, ensuring the highest standards of integrity for all retail horological assets in Devon.
4. Why buy from an independent specialist in Devon?
Independents offer face-to-face accountability, strict physical verification, and on-site technical workshop skills that national online marketplaces cannot match, a service line maintained since August 2000.
2. Eco-Drive Technology
5. What is Citizen Eco-Drive technology?
It is a light-powered system that converts any light source (natural or artificial) into energy stored in a permanently rechargeable lithium-ion cell, ensuring standard daily runtime parameters without parasitic loss.
6. Does the AT0200-56L ever need a battery?
No, it uses a secondary cell that is continuously charged by ambient light vectors, eliminating the need for traditional silver-oxide cell replacements and reducing mechanical component downtime.
7. How long is the power reserve from full charge?
The AT0200-56L has a dark storage power reserve of approximately 150 days from a full charge condition, allowing the internal quartz oscillator to pulse cleanly in absolute darkness.
8. How long does it take to charge from solar light?
Under direct outdoor sunlight conditions, the amorphous dial panel can gain a full day of operational power in just 2 minutes of exposure, minimizing setup lag in the South West environment.
3. Movement & Chronograph
9. What movement is in the AT0200-56L?
It utilizes the high-stability Citizen H500 Eco-Drive chronograph movement, featuring a integrated layout designed for multi-dial synchronization and precise gear train stepping.
10. How accurate is the H500 movement?
The movement maintains an accuracy of plus or minus 15 seconds per month, far exceeding standard mechanical layouts and ensuring maintenance-free precision for our South West clientele.
11. What are the three sub-dials for?
They represent the chronograph second hand, the 60-minute counter register, and a 24-hour time indicator for clear AM/PM tracking relative to the central layout hands.
12. Can the chronograph be used continuously?
It is recommended to use the chronograph for timing specific events; continuous circuit activation will deplete the secondary lithium-ion cell faster than traditional background timekeeping.
4. Materials & Metallurgy
13. What grade of stainless steel is used for the case?
The case is crafted from 316L surgical-grade stainless steel, offering elite resistance to saltwater corrosion and perspiration vectors encountered across Devon maritime borders.
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, providing a high-quality weighted feel and reliable physical mass presence on the wrist plane.
15. Is the case hypoallergenic for sensitive skin?
Yes, the low-carbon content of the 316L alloy makes it safe for daily contact with sensitive skin profiles, strictly adhering to UK safety regulations and verified in Totnes.
16. What is the Vickers Hardness of the case?
The polished 316L steel case features a hardness rating between 200 and 240 HV, resisting surface scratches during daily field operations and maintaining external lustre.
5. Water Resistance & Seals
17. Is the AT0200-56L waterproof?
It is rated to 10 ATM (100M), making it suitable for surface swimming and snorkelling parameters, but not for specialized deep-sea diving applications where dynamic pressure exceeds limits.
18. What does 100m water resistance technically mean?
It means the watch can withstand a static pressure of 10 atmospheres, equivalent to 100 metres of non-dynamic water depth before the gasket borders suffer deflection.
19. Should I wear my watch in a hot shower?
No, intense heat and steam can expand internal elastomer gaskets rapidly, potentially compromising the movement's moisture protection shield over long periods.
20. Can you pressure test the watch in Totnes?
Yes, our workshop provides technical vacuum pressure testing to verify seal integrity at 19 Fore Street, a capability maintained since our establishment in August 2000.
© 2026 H.E. Phillips Ltd - Registered Sponsor with the Birmingham Assay Office. All Technical Data verified for accuracy.
Citizen AT0200-56L
Blue Dial Watch
Men's Chronograph
Stainless Steel Watch
Field Watch
39mm Watch
Eco-Drive
Solar Powered
Sustainable Luxury
100m Water Resistant
Citizen Totnes
H.E. Phillips Ltd
Luxury Watches 2026
Utility Chic
No Battery Watch
H500 Movement
South West Jewellers
Professional Mens Watch
Graduation Gift
Authorized Citizen Stockist
East Gate Clock Tower
Royal Seven Stars
River Dart Sustainable.
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