The Citizen AQ4100-57E from The CITIZEN collection is engineered to deliver disciplined precision and enduring performance — a refined expression of modern Japanese horological expertise.

At its heart is the Eco-Drive Calibre A060, a high-accuracy solar movement individually regulated to maintain an exceptional ±5 seconds per year. Precision begins long before assembly, with only the most stable crystal oscillators selected after extended observation and retesting to meet Citizen’s exacting standards. 

To safeguard accuracy in changing environments, the A060 integrates an advanced temperature compensation systemthat measures internal temperature 1,440 times per day in 0.1-degree increments, automatically adjusting to counteract thermal variation. This continuous correction enhances long-term stability beyond standard quartz performance. 

Citizen’s proprietary Eco-Drive technology continuously converts natural or artificial light into stored energy, eliminating the need for battery replacement. When fully charged, the movement provides approximately 1.5 years of autonomy, even without further light exposure.

In addition to precision regulation and autonomy, the A060 incorporates intelligent stability systems designed to preserve long-term performance:

• Shock Detection System guards movement alignment after impact

• Automatic Hand Position Adjustment preserves visual precision

• Overcharging Prevention Function protects energy storage

• Insufficient Charge Warning Function alerts when reserves are low

• Energy Saving Function conserves power in darkness

• Time Difference Correction enables seamless local time adjustment

• Instant Date Change ensures precise midnight calendar transition

• Perpetual Calendar automatically accounts for month length variations and leap years

Each The CITIZEN timepiece is assembled in a dedicated workshop in Nagano, Japan, where master craftsmen — called Meisters — perform final regulation and refined finishing.

The 38.3 mm Super Titanium™ case is remarkably lightweight yet exceptionally resistant to scratches and corrosion. Secured by a matching Super Titanium™ triple-link bracelet with fold-over clasp and push buttons, the watch is boldly modern yet quietly refined. Protected by a dual-spherical sapphire crystal, the black dial features a subtle eagle feather pattern, creating captivating interplay between light, texture, and colour that reflects both visual and technical depth. 

The AQ4100-57E is not a conventional quartz watch. It is a regulated solar precision instrument engineered for autonomy, environmental stability, and enduring execution.

Technical Specifications

Model: AQ4100-57E
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 an extended observation period.

Temperature Compensation System:
Internal temperature measured 1,440 times per day and automatically compensated in 0.1-degree increments.

Solar Energy Conversion:
Continuously converts natural or artificial light into stored energy — no battery replacement required.

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™ (silver tone)

• Crystal: Dual-Spherical Sapphire Crystal

• Dial: Black with subtle eagle feather pattern

• Bracelet: Super Titanium™ triple-link bracelet

• Clasp: Fold-Over Clasp with Push Buttons

• Water Resistance: WR100 / 10 Bar / 333 ft

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