Side by side

Citizen Atomic Perpetual A-TvsSeiko Prospex Sea

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

Prospex Sea
SeikoProspex Sea
MSRP $795

At a glance

11 of 29 specs differ
Diameter
Atomic Perpetual A-T41mm
Prospex Sea34mm
Power Reserve
Atomic Perpetual A-T40h
Prospex Sea40h
Water Resistance
Atomic Perpetual A-T200m
Prospex Sea200m
MSRP
Atomic Perpetual A-T
Prospex Sea$795

Full specifications

Case

5 specs
Category
Pilot
Diver
Diameter
41mm
34mm
Thickness
12mm
8.7mm
Lug-to-Lug
46mm
40.8mm
Lug Width
20mm
16mm

Crystal & Dial

3 specs
AR Coating
Underside
Anti-reflective coating on inner surface
Dial Color
Blue
Black
Lume
None
LumiBrite on hands and index(es)

Movement

2 specs
Caliber
H800
6N01
Type
Solar
Quartz

Pricing

1 specs
MSRP
$795

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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 Atomic Perpetual A-T

Owners widely praise the Citizen Atomic Perpetual A-T for its handsome appearance, solid fit and finish, comfortable bracelet, and intuitive world time function. Its perpetual calendar and atomic timekeeping are highlighted as major conveniences, maintaining accuracy within 0.5 seconds even without syncing, and owners appreciate its "set & forget" nature and solar charging. The watch features a modest, stylish blue dial with delicate design details and a clutter-free layout, along with high water resistance without a screw-down crown and light titanium construction. Some find the dial unnecessarily busy, and its time zone functionality is noted as less useful outside the US, with atomic sync being less compelling below the equator. Accuracy is reported as +/-15 seconds per month if not syncing, but +/-0 seconds if it syncs via radio signal. Some find the watch a bit on the large side.

Seiko Prospex Sea

Owners widely praise the Seiko Prospex Sea for its excellent value, robust build, and superb lume, with many appreciating its comfortable wearability due to its case shape and lug-to-lug distance. Reviewers consistently highlight its impressive finishing and classic dive watch design, often noting the bright LumiBrite lume. Some owners find the watch to be large, thick, and heavy, while others consider it the perfect size, indicating a split opinion on wearability for smaller wrists. The power reserve from some movements is noted as less than newer variants, and the clasp quality receives mixed feedback. Overall, owners and reviewers rate the Seiko Prospex Sea highly for its exceptional finishing and value proposition in the dive watch market.

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