Side by side

Citizen Eco-DrivevsZelos Hammerhead V3 300m Bronze

The numbers, the dial colors, the calibers — laid out so you can stop flipping between tabs.

Eco-Drive
CitizenEco-Drive
MSRP $338
Hammerhead V3 300m Bronze
ZelosHammerhead V3 300m Bronze
MSRP $449

At a glance

12 of 29 specs differ
Diameter
Eco-Drive42.3mm
Hammerhead V3 300m Bronze44mm
Power Reserve
Eco-Drive40h
Hammerhead V3 300m Bronze40h
Water Resistance
Eco-Drive100m
Hammerhead V3 300m Bronze300m
MSRP
Eco-Drive$338
Hammerhead V3 300m Bronze$449

Full specifications

Case

7 specs
Category
Casual
Diver
Diameter
42.3mm
44mm
Thickness
12mm
13mm
Lug-to-Lug
46mm
44mm
Lug Width
20mm
22mm
Material
Stainless Steel
Titanium
Water Resistance
100m
300m

Crystal & Dial

2 specs
Crystal
Mineral
Domed Sapphire
Dial Color
Green
Bronze - Frost

Movement

2 specs
Caliber
J800
Seiko NH35
Type
Solar
Automatic

Pricing

1 specs
MSRP
$338
$449

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What people say

Owners + reviewers, side by side

Synthesized for each watch independently from owner discussions, enthusiast forums, written reviews, and video reviewers.

Citizen Eco-Drive

Citizen Eco-Drive watches are widely praised for exceptional durability and reliability, with many owners reporting theirs lasting over a decade without issue and some even suggesting they are "Buy It For Life" (BIFL) models. Owners appreciate the ease of use and reliability of the solar-powered quartz movement, with one noting their watch was only off by 2 minutes after five years of disuse. Specific models are noted for their engineering marvels, such as the world's thinnest light-powered watch at 2.98mm thick, a 100-day power reserve, and materials like cermet bezels and titanium construction with sapphire crystals. However, a few users have experienced malfunctions, including one chronograph that stopped keeping time shortly after purchase, requiring a lengthy warranty repair. The battery can degrade and may need replacement after 20+ years, and owners suggest keeping the watch charged in light to prolong its life.

Zelos Hammerhead V3 300m Bronze

Owners widely praise the Zelos Hammerhead V3 300m Bronze for its distinctive 70s-inspired design, slim 13.5mm case, and improved lume, offering a sophisticated timepiece at an accessible price point starting at $349. The unique dial is noted for evoking an otherworldly feeling, and the comfortable bracelet features on-the-fly micro-adjustment. Some enthusiasts express frustration with shipping delays and a desire to see the watch on a wrist before purchase. One owner flags that the clasp material could be more scratch-resistant, and resizing bracelet pins can be stubborn. On balance, owners rate the Zelos Hammerhead V3 300m Bronze highly for its unique design and build quality at its price point.

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