Side by side

Fortis Marinemaster M-40vsSeiko Prospex LX line

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
Prospex LX line
SeikoProspex LX line
MSRP $5,500

At a glance

15 of 29 specs differ
Diameter
Marinemaster M-4040mm
Prospex LX line44.8mm
Power Reserve
Marinemaster M-4038h
Prospex LX line72h
Water Resistance
Marinemaster M-40300m
Prospex LX line200m
MSRP
Marinemaster M-40$3,520
Prospex LX line$5,500

Full specifications

Case

7 specs
Category
Diver
GMT
Diameter
40mm
44.8mm
Thickness
13mm
14.7mm
Lug-to-Lug
50.9mm
Lug Width
21mm
22mm
Material
Stainless Steel
Titanium
Water Resistance
300m
200m

Crystal & Dial

3 specs
AR Coating
Inner
Super-clear coating
Dial Color
Orange
Black
Lume
None
LumiBrite on hands and index(es)

Movement

4 specs
Caliber
Sellita SW220-1
5R66
Type
Automatic
Spring Drive
Power Reserve
38h
72h
Jewels
26
30

Pricing

1 specs
MSRP
$3,520
$5,500

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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.

Seiko Prospex LX line

Owners widely report the dial's blue-green sunburst is phenomenal, and the sapphire glass features blue AR coating. Some owners feel the high price limits discounts and sales, with one AD noting extremely low sales due to the cost. One owner reported DLC peeling off a two-week-old watch, and another noted quality control issues like bezel inserts and fallen second hands. On balance, owners consider the Seiko Prospex LX line a nicely built watch, though pricing led to poor sales and its discontinuation.

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