Citizen Eco-Drive CA4640-09L, 41mm, Blue Dial, Black Leather Strap

Name: Citizen Eco-Drive 41mm, Blue Dial Black Leather Strap
Brand: Citizen
SKU: citizen-ca4640-09l
Price: 254.45 USD
Availability: InStock

By Serdar D.Content updated 25 October 2026

Citizen Eco-Drive 41mm, Blue Dial Black Leather Strap

The Citizen CA4640-09L is a men's solar-powered chronograph watch featuring a blue dial, a 41mm stainless steel case, and 100m water resistance.

Price

US$254.45US$268.47↓ -5%

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About this item

1/5 Second Chronograph Measures up to 60 Minutes, 12/24 Hour Time, Date
Silver-Tone Stainless Steel Case
Mineral Crystal
100MM Water Resistant

Top Highlights

Brand: Citizen
Model Name: Eco-Drive
Model Number: CA4640-09L
Department: Men
Item Type: Watch
Manufacturer: Citizen
First Available: 5 August 2025

Features & Specs

Display: Analog
Movement Type: Solar
Calibre: B612
Power Source: Light Powered
Additional Features: Water-resistant
Complications: Chronograph, Date, 12/24 hour indicator
Battery: No battery (solar)
Strap Type: Two Piece Strap
Case Material: Stainless steel
Case Size: 41.0 mm
Case Thickness: 12.5 mm
Lug Width: 22.0 mm
Weight: 280 g
Water Resistance: 100 m
Strap: Leather
Clasp: Buckle
Crystal: Mineral crystal

Style

Dial Shape: Round
Dial Colour: Blue
Band Color: Black
Face Style: Crosshair

Will it fit your wrist?

Best on 17.0–18.0 cm (6.7–7.1 in) wrists

A 41 mm case sits just right on these wrists. If your wrist is 18.0–19.0 cm, it looks smaller and more understated. If your wrist is 16.0–17.0 cm, it looks bigger and bolder.

Measure your wrist and see what fits

A rough guide based on case diameter only.

Is this watch big or small?

65% of the men's watches we list are bigger than this one

The most common men's size is 42 mm (174 models). 70 models are 41 mm, like this one.

All our watch size data

Description

The Citizen CA4640-09L Eco-Drive Sport Casual Watch is designed for the modern man seeking a blend of sporty functionality and everyday style. This timepiece offers reliable performance powered by light, making it a practical choice for various activities.

At its core, this model features a solar-powered Eco-Drive movement, eliminating the need for battery changes. It is housed in a robust 41mm stainless steel case with a striking blue dial protected by a mineral crystal, ensuring durability for daily wear. With a water resistance of 100 metres, it is suitable for swimming and snorkelling.

Beyond its core timekeeping, the CA4640-09L includes a 1/5 second chronograph that measures up to 60 minutes, along with 12/24 hour time and a date display. The black leather strap with a classic buckle provides a comfortable and secure fit, making it a versatile accessory for both casual and semi-formal occasions.

Frequently Asked Questions

Is the Citizen CA4640-09L suitable for daily wear and water activities?

Yes, the Citizen CA4640-09L is designed for daily wear with its durable stainless steel case and mineral crystal. Its 100-metre water resistance makes it suitable for swimming and snorkelling, but it is not recommended for diving.

How does the Eco-Drive movement in this Citizen watch work?

The Eco-Drive movement in the Citizen CA4640-09L converts any light source, whether natural or artificial, into electrical energy. This energy is stored in a power cell, allowing the watch to run for extended periods without needing a battery replacement, offering continuous operation.

What are the main differences between the CA4640-09L and other Citizen chronographs in a similar price range?

The CA4640-09L stands out with its specific blue dial and 41mm case size, offering a balanced aesthetic. While many Citizen chronographs share the reliable Eco-Drive movement, this model's particular design and complication set, including 1/5 second chronograph and 12/24 hour display, cater to a sport-casual audience.

What kind of maintenance does the Citizen CA4640-09L require?

Thanks to its Eco-Drive solar movement, the Citizen CA4640-09L requires minimal maintenance. Simply ensure it is regularly exposed to light to keep it charged. Periodic cleaning of the case and strap, and checking the water resistance seals every few years, will help maintain its condition.

Is the leather strap on the CA4640-09L interchangeable, and what wrist sizes does it fit?

The leather strap on the Citizen CA4640-09L is generally interchangeable with other 22mm straps, allowing for personalisation. This watch, with its 41mm case, typically fits a wide range of wrist sizes, comfortably accommodating most men's wrists from approximately 6.5 to 8 inches in circumference.

Editor's take

The Citizen CA4640-09L represents a compelling entry into the realm of accessible, light-powered chronographs, perfectly suited for the active individual who values both functionality and environmental consciousness. As part of Citizen's renowned Eco-Drive line, this model leverages decades of innovation in solar technology, offering a reliable and low-maintenance timekeeping solution.

Technically, the watch is powered by Citizen's proprietary Eco-Drive movement, which converts any light source into energy, storing it in a power cell. This eliminates the need for traditional battery replacements, a significant convenience. The 41mm stainless steel case provides a balanced presence on the wrist, while the mineral crystal offers adequate scratch resistance for daily wear, complemented by a robust 100-metre water resistance.

While the mineral crystal is durable, it is worth noting that it is more prone to scratches than sapphire, which is often found in higher-end chronographs. This is a common trade-off at this price point, reflecting a focus on affordability and robust daily utility rather than premium materials. The chronograph function, measuring up to 60 minutes in 1/5 second increments, is precise enough for most casual timing needs.

This Citizen CA4640-09L is an excellent choice for those seeking a dependable, stylish, and eco-friendly chronograph for everyday use, particularly for individuals who appreciate the convenience of a solar-powered watch and a classic leather strap. It serves as a strong alternative to quartz chronographs requiring frequent battery changes, offering a blend of practicality and sporty aesthetics.