The Citizen AQ4100-57C from The CITIZEN collection is a study in disciplined precision. Built around the high-accuracy Eco-Drive Calibre A060, this timepiece is individually regulated to achieve an extraordinary ±5 seconds per year — a performance standard reserved for the most rigorously controlled quartz movements in production.

The journey toward that precision begins with the careful selection of crystal oscillators. Only the most stable units are approved following a six-month observation period to confirm long-term consistency. Even after final assembly, each movement is retested to ensure it meets Citizen’s uncompromising regulation standards.

To further preserve accuracy, the A060 integrates an advanced temperature compensation system. Internal temperature is measured 1,440 times per day in 0.1-degree increments, allowing the movement to automatically adjust in real time. Because temperature fluctuation is one of the primary variables affecting quartz performance, this continuous calibration ensures environmental changes never compromise precision.

Citizen’s Eco-Drive technology continuously converts natural or artificial light into stored energy, eliminating battery replacement while providing approximately 1.5 years of autonomy when fully charged.

Beyond regulation and energy efficiency, the A060 incorporates intelligent protection systems engineered to maintain stability over time:

• Shock Detection safeguards alignment following impact.

• Automatic Hand Position Adjustment ensures perfect visual precision.

• Overcharging Prevention regulates energy levels.

• Insufficient Charge Warning alerts the wearer when reserves are low.

• Energy Saving Function conserves power in low-light conditions.

• Time Difference Correction enables seamless hour adjustment.

• Instant Date Change ensures precise midnight transition.

• Perpetual Calendar automatically accounts for varying month lengths and leap years.

Each The CITIZEN timepiece is assembled in a dedicated workshop in Nagano, Japan, under the supervision of master craftsmen known as Meisters, ensuring both technical integrity and refined finishing.

The 38.3mm case and integrated bracelet are crafted from Super Titanium™, a proprietary material significantly lighter and more scratch resistant than stainless steel. A dual spherical sapphire crystal protects the dial, enhancing clarity and structural durability. The white dial reflects disciplined execution — proportioned, restrained, and precisely finished.

The AQ4100-57C is not a conventional quartz watch. It is a regulated solar precision instrument engineered for autonomy, temperature stability, and enduring performance.

Technical Specifications

Model: AQ4100-57C
Collection: The CITIZEN

Movement & Regulation

Calibre: Eco-Drive A060 (Solar Powered)
Accuracy: ±5 seconds per year
Power Reserve: Approximately 1.5 years when fully charged

Crystal Oscillator Selection:
Only rigorously tested oscillators are selected following a six-month stability observation period.

Temperature Compensation System:
Measures internal temperature 1,440 times daily in 0.1-degree increments and automatically adjusts to maintain peak precision.

Solar Energy Conversion:
Continuously converts light into stored energy, eliminating battery replacement.

Stability & Intelligent Functions

Power Reserve Indicator
Overcharging Prevention Function
Insufficient Charge Warning Function
Energy Saving Function
Shock Detection System
Automatic Hand Position Adjustment
Time Difference Correction
Instant Date Change
Perpetual Calendar

Case & Construction

Case Size: 38.3 mm
Material: Super Titanium™
Crystal: Dual Spherical Sapphire Crystal
Dial: White with applied indices
Bracelet: Super Titanium™ bracelet with fold-over clasp and push button
Water Resistance: WR100 / 10Bar / 333ft

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