Side by side

Bremont Supermarine 300MvsSeiko King Seiko VANAC Seiko Boutique Exclusive Edition

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

15 of 29 specs differ
Diameter
Supermarine 300M40mm
King Seiko VANAC Seiko Boutique Exclusive Edition41mm
Power Reserve
Supermarine 300M40h
King Seiko VANAC Seiko Boutique Exclusive Edition72h
Water Resistance
Supermarine 300M300m
King Seiko VANAC Seiko Boutique Exclusive Edition100m
MSRP
Supermarine 300M$3,550
King Seiko VANAC Seiko Boutique Exclusive Edition$3,300

Full specifications

Case

7 specs
Category
Diver
Dress
Diameter
40mm
41mm
Thickness
12mm
14.3mm
Lug-to-Lug
45.1mm
Lug Width
20mm
17mm
Material
904L Stainless Steel
Stainless Steel
Water Resistance
300m
100m

Crystal & Dial

4 specs
Crystal Shape
Flat
Box
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
8L45
Power Reserve
40h
72h
Jewels
25
35

Pricing

1 specs
MSRP
$3,550
$3,300

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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 King Seiko VANAC Seiko Boutique Exclusive Edition

Owners and reviewers widely praise the King Seiko VANAC Seiko Boutique Exclusive Edition for its intricate finishing on its angular case and bracelet, comfortable feel on the wrist, and retro-inspired design. Specific call-outs include the crisp blue-and-white colorway, vibrant titanium case design, novel dial ring, and striking purple dial options. Owners consider it a premium and value-for-money piece, appreciating its dial texture, polished and brushed finishes, and intentional 70s-inspired aesthetic. The 8L45 movement is noted for its 70-72 hour power reserve, with accuracy figures ranging from +10/-5 seconds per day to -5/+10 seconds per day. One reviewer found the accuracy not great for the price point, while another noted it as slightly loose compared to other brands. The lack of lume limits it to daytime use, and the hidden butterfly clasp is considered unintuitive by one source. Some owners wished the bracelet tapered more at the clasp.

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