Side by side

Fortis Marinemaster M-40vsDOXA SUB 300 Carbon

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
SUB 300 Carbon
DOXASUB 300 Carbon
MSRP $4,390

At a glance

12 of 29 specs differ
Diameter
Marinemaster M-4040mm
SUB 300 Carbon42.5mm
Power Reserve
Marinemaster M-4038h
SUB 300 Carbon38h
Water Resistance
Marinemaster M-40300m
SUB 300 Carbon300m
MSRP
Marinemaster M-40$3,520
SUB 300 Carbon$4,390

Full specifications

Case

5 specs
Diameter
40mm
42.5mm
Thickness
13mm
12mm
Lug-to-Lug
46mm
Lug Width
21mm
20mm
Material
Stainless Steel
Carbon

Crystal & Dial

4 specs
Crystal Shape
Flat
Domed
AR Coating
Inner
Yes
Dial Color
Orange
Aquamarine
Lume
None
Super-LumiNova

Movement

2 specs
Caliber
Sellita SW220-1
COSC Chronometer
Jewels
26
25

Pricing

1 specs
MSRP
$3,520
$4,390

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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.

DOXA SUB 300 Carbon

The DOXA SUB 300 Carbon is widely praised for its exceptionally lightweight and comfortable forged carbon case, making it an ideal vacation or everyday watch. Owners and reviewers highlight the vibrant dial colors, the satisfyingly clicky bezel action, and the comfortable, adjustable rubber strap with a clever clasp. Its COSC-certified ETA 2824-2 movement is noted for reliable timekeeping, with one owner reporting +0.9 seconds per day and another an average of +5 seconds per day, though a 38-hour power reserve is a trade-off for its slimness. Some reviewers point out that the no-decompression bezel markings may not align with current diving science and that the luminous markers are less bright than some alternatives. The integrated rubber strap requires cutting to size, and the clasp has sharp edges. On balance, owners and reviewers rate the DOXA SUB 300 Carbon highly for its unique, lightweight carbon construction and comfortable wearability.

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