Side by side

Fortis Marinemaster M-40vsFormex Reef 39.5 mm

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
Reef 39.5 mm
FormexReef 39.5 mm
MSRP $2,230

At a glance

10 of 29 specs differ
Diameter
Marinemaster M-4040mm
Reef 39.5 mm39.5mm
Power Reserve
Marinemaster M-4038h
Reef 39.5 mm56h
Water Resistance
Marinemaster M-40300m
Reef 39.5 mm300m
MSRP
Marinemaster M-40$3,520
Reef 39.5 mm$2,230

Full specifications

Case

4 specs
Diameter
40mm
39.5mm
Thickness
13mm
11mm
Lug-to-Lug
45.5mm
Lug Width
21mm
22mm

Crystal & Dial

2 specs
Dial Color
Orange
Bahama Blue
Lume
None
Super-LumiNova

Movement

3 specs
Caliber
Sellita SW220-1
Sellita SW300-1
Power Reserve
38h
56h
Jewels
26
25

Pricing

1 specs
MSRP
$3,520
$2,230

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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.

Formex Reef 39.5 mm

The Formex Reef 39.5 mm is widely praised for its refined finishing, comfortable and well-proportioned case design, and impressive specifications for its price point, including COSC-certified Sellita SW300-1 movement and 300m water resistance. Owners and reviewers highlight the tool-less micro-adjust clasp and quick-release spring bars as practical features. Some reviewers note that the 22mm lug width feels slightly disproportionate to the smaller case, and the bracelet could benefit from more taper, though this is a point of contention for some owners who value the overall package. A prototype crown protrusion issue is noted as being addressed for production. On balance, owners and reviewers rate the Formex Reef 39.5 mm highly for its excellent value and well-executed design.

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