Side by side

Bremont Supermarine 300MvsCitizen Atomic Perpetual A-T

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

Supermarine 300M
BremontSupermarine 300M
MSRP $3,550

At a glance

10 of 29 specs differ
Diameter
Supermarine 300M40mm
Atomic Perpetual A-T41mm
Power Reserve
Supermarine 300M40h
Atomic Perpetual A-T40h
Water Resistance
Supermarine 300M300m
Atomic Perpetual A-T200m
MSRP
Supermarine 300M$3,550
Atomic Perpetual A-T

Full specifications

Case

5 specs
Category
Diver
Pilot
Diameter
40mm
41mm
Lug-to-Lug
46mm
Material
904L Stainless Steel
Stainless Steel
Water Resistance
300m
200m

Crystal & Dial

2 specs
AR Coating
Inner
Underside
Dial Color
Green
Blue

Movement

2 specs
Caliber
BE-92AE
H800
Type
Automatic
Solar

Pricing

1 specs
MSRP
$3,550

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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.

Bremont Supermarine 300M

The Bremont Supermarine 300M is praised for its comfortable 40mm and 42mm case sizes, with owners noting the 42mm wears well on smaller wrists due to its lug design. One owner highlights the 13mm thinness of the 40mm case, considered compact for a 300m diver. The watch is priced at $1375. On balance, owners and reviewers appreciate the Bremont Supermarine 300M for its wearability and compact dimensions, especially for a dive watch.

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.

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