Side by side

Fortis Marinemaster M-40vsGrand Seiko SLGW003

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
SLGW003
Grand SeikoSLGW003
MSRP $11,600

At a glance

14 of 29 specs differ
Diameter
Marinemaster M-4040mm
SLGW00338.6mm
Power Reserve
Marinemaster M-4038h
SLGW00380h
Water Resistance
Marinemaster M-40300m
SLGW00330m
MSRP
Marinemaster M-40$3,520
SLGW003$11,600

Full specifications

Case

7 specs
Category
Diver
Dress
Diameter
40mm
38.6mm
Thickness
13mm
9.95mm
Lug-to-Lug
45mm
Lug Width
21mm
20mm
Material
Stainless Steel
Titanium
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
$11,600

Follow this matchup

Get a note when Fortis Marinemaster M-40 vs Grand Seiko SLGW003 gets more votes, a community discussion, or a price drop. No account needed.

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 SLGW003

The Grand Seiko SLGW003 is praised for its comfortable, lightweight Brilliant Hard Titanium case, meticulous finishing, and a clean, modern dial. Reviewers highlight the new 9SA4 manual-wind movement, noting its attractive finishing, 80-hour power reserve, and accuracy of -3/+5 seconds per day. It is considered a versatile dress watch blending vintage and future Grand Seiko spirit. The €11,700 price is noted as expensive, with some questioning its value. Overall, reviewers rate the Grand Seiko SLGW003 highly for its elegant design and impressive manual-wind movement at its flagship price point.

Keep exploring

More watches worth a look

Matched to the watches above on size, movement, style and price — microbrands first. Open any one to dig in.

Adjacent matchups

People also compared

Comparisons nearby in the catalog — alternatives to the watches above paired against the matchup.