Side by side

Bremont Supermarine 300MvsSeestern S456 GMT

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

Supermarine 300M
BremontSupermarine 300M
MSRP $3,550
S456 GMT
SeesternS456 GMT
MSRP $299

At a glance

15 of 29 specs differ
Diameter
Supermarine 300M40mm
S456 GMT41mm
Power Reserve
Supermarine 300M40h
S456 GMT41hh
Water Resistance
Supermarine 300M300m
S456 GMT200m
MSRP
Supermarine 300M$3,550
S456 GMT$299

Full specifications

Case

7 specs
Category
Diver
GMT
Diameter
40mm
41mm
Thickness
12mm
13mm
Lug-to-Lug
49mm
Material
904L Stainless Steel
316L Stainless Steel
Finish
Brushed and polished
Brushed + Polished
Water Resistance
300m
200m

Crystal & Dial

2 specs
Dial Color
Green
Sunray style, applied and Diamond cut Indices, C1 lume
Lume
None
C1

Movement

5 specs
Caliber
BE-92AE
Seiko NH34
Beat Rate
28,800 vph
3 vph
Power Reserve
40h
41hh
Jewels
25
24
Complications
None
GMT

Pricing

1 specs
MSRP
$3,550
$299

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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.

Seestern S456 GMT

Owners widely praise the Seestern S456 GMT for its exceptional value and finishing that exceeds expectations, with one owner noting its accuracy surpasses that of their Seiko 5. The dial displays a pearl-like rainbow effect. Some owners would prefer a bidirectional bezel over the current unidirectional one. The Seestern S456 GMT features an NH34 movement, a 39.5mm case, sapphire crystal, and an adjustable clasp. On balance, owners rate the Seestern S456 GMT highly for its impressive finishing and value proposition at its price point.

From video reviewers

The watch features stunning, detailed finishing that is difficult to top. Reviewers did not reach a consensus on any weaknesses.

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