Side by side

Bremont Supermarine 300MvsMarathon GSAR (Government Search & Rescue) Diver's Automatic

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

Supermarine 300M
BremontSupermarine 300M
MSRP $3,550
GSAR (Government Search & Rescue) Diver's Automatic
MarathonGSAR (Government Search & Rescue) Diver's Automatic
MSRP $2,100

At a glance

7 of 29 specs differ
Diameter
Supermarine 300M40mm
GSAR (Government Search & Rescue) Diver's Automatic41mm
Power Reserve
Supermarine 300M40h
GSAR (Government Search & Rescue) Diver's Automatic40h
Water Resistance
Supermarine 300M300m
GSAR (Government Search & Rescue) Diver's Automatic300m
MSRP
Supermarine 300M$3,550
GSAR (Government Search & Rescue) Diver's Automatic$2,100

Full specifications

Case

4 specs
Diameter
40mm
41mm
Thickness
12mm
14mm
Lug-to-Lug
48mm
Material
904L Stainless Steel
316L Stainless Steel

Crystal & Dial

1 specs
Dial Color
Green
Anthracite

Movement

1 specs
Caliber
BE-92AE
Sellita SW200-1

Pricing

1 specs
MSRP
$3,550
$2,100

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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.

Marathon GSAR (Government Search & Rescue) Diver's Automatic

The Marathon GSAR (Government Search & Rescue) Diver's Automatic is widely praised for its legibility, comfort, and exceptional tritium illumination, with reviewers highlighting its utilitarian, military-equipment feel and a 41mm case size considered ideal. Owners appreciate its grippy bezel and the 300 meters of water resistance provided by the screw-down crown, deeming it a solid value for a Swiss-made tool watch. Some owners report quality control issues, with one user needing to warranty two watches, and another notes the GSAR wears taller than other models, leading to occasional bumping. The reliable ETA 2824-A2 movement is a consistent feature. Overall, owners and reviewers rate the Marathon GSAR (Government Search & Rescue) Diver's Automatic highly for its bright tritium lume and robust, no-nonsense tool watch design.

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