Side by side

Fortis Marinemaster M-40vsGrand Seiko SLGW004

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

Marinemaster M-40
FortisMarinemaster M-40
MSRP $3,520
SLGW004
Grand SeikoSLGW004
MSRP $30,000

At a glance

14 of 29 specs differ
Diameter
Marinemaster M-4040mm
SLGW00438.8mm
Power Reserve
Marinemaster M-4038h
SLGW00480h
Water Resistance
Marinemaster M-40300m
SLGW00430m
MSRP
Marinemaster M-40$3,520
SLGW004$30,000

Full specifications

Case

7 specs
Category
Diver
Dress
Diameter
40mm
38.8mm
Thickness
13mm
10.4mm
Lug-to-Lug
43.7mm
Lug Width
21mm
19mm
Material
Stainless Steel
Gold
Water Resistance
300m
30m

Crystal & Dial

2 specs
AR Coating
Inner
Yes
Dial Color
Orange
Black

Movement

4 specs
Caliber
Sellita SW220-1
9SA4
Type
Automatic
Manual
Power Reserve
38h
80h
Jewels
26
25

Pricing

1 specs
MSRP
$3,520
$30,000

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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.

Fortis Marinemaster M-40

Owners praise the Fortis Amber Orange for its gorgeous appearance and strong wrist presence, noting its crazy lume and 70-hour power reserve. The Doxa SUB 300T, described as having a superb, eccentric design with a highly legible dial and functional no-decompression bezel, uses an ETA 2824-2 movement. However, the SUB 300T's 42.5mm case wears large and its 14mm thickness is not ideal for dress shirts, though it boasts 1,200m water resistance. On balance, owners appreciate the Fortis Amber Orange for its striking aesthetics and impressive lume.

Grand Seiko SLGW004

The Grand Seiko SLGW004 is praised for its elegant, faithful reissue design and impressive technical execution, featuring a new 9SA4 hi-beat manual-winding movement with an 80-hour power reserve and accuracy of -3/+5 seconds per day. Reviewers highlight the sharp case facets, double-signed dial, and beautifully decorated movement visible through the display caseback, along with an enjoyable winding experience. One reviewer noted a desire for better water resistance and expressed a dislike for the etched sapphire case back. Overall, reviewers rate the Grand Seiko SLGW004 highly for its elegant design and technically impressive movement.

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