Side by side

Bremont Supermarine 300MvsSeiko Prospex Land Mechanical

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

Supermarine 300M
BremontSupermarine 300M
MSRP $3,550
Prospex Land Mechanical
SeikoProspex Land Mechanical
MSRP $995

At a glance

13 of 29 specs differ
Diameter
Supermarine 300M40mm
Prospex Land Mechanical39.5mm
Power Reserve
Supermarine 300M40h
Prospex Land Mechanical72h
Water Resistance
Supermarine 300M300m
Prospex Land Mechanical200m
MSRP
Supermarine 300M$3,550
Prospex Land Mechanical$995

Full specifications

Case

6 specs
Category
Diver
Field
Diameter
40mm
39.5mm
Thickness
12mm
12.7mm
Lug-to-Lug
46.4mm
Material
904L Stainless Steel
Stainless Steel
Water Resistance
300m
200m

Crystal & Dial

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

Movement

3 specs
Caliber
BE-92AE
6R55
Power Reserve
40h
72h
Jewels
25
24

Pricing

1 specs
MSRP
$3,550
$995

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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.

Seiko Prospex Land Mechanical

Owners widely praise the Seiko Prospex Land Mechanical for its unique style, useful day-date complication, and value, with some finding it suitable as a one-watch-for-all-occasions. Accuracy and durability are noted as strengths, with one owner reporting good performance even in water submersion. However, multiple owners criticize its size, with figures around 41mm to 43mm and 14.4mm thickness being flagged as too large and thick for smaller wrists. The Hardlex crystal and a potentially loose inner compass bezel are also points of criticism. On balance, owners rate the Seiko Prospex Land Mechanical highly for its unique style and value, despite concerns over its substantial dimensions.

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