Side by side

Fortis Marinemaster M-40vsSeestern S450 Ocean Star

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
S450 Ocean Star
SeesternS450 Ocean Star
MSRP $299

At a glance

13 of 29 specs differ
Diameter
Marinemaster M-4040mm
S450 Ocean Star40mm
Power Reserve
Marinemaster M-4038h
S450 Ocean Star41h
Water Resistance
Marinemaster M-40300m
S450 Ocean Star100m
MSRP
Marinemaster M-40$3,520
S450 Ocean Star$299

Full specifications

Case

5 specs
Thickness
13mm
12mm
Lug-to-Lug
48mm
Lug Width
21mm
20mm
Material
Stainless Steel
316L Stainless Steel
Water Resistance
300m
100m

Crystal & Dial

2 specs
Dial Color
Orange
White
Lume
None
Tritium

Movement

5 specs
Caliber
Sellita SW220-1
TMI NH35A
Beat Rate
28,800 vph
21,600 vph
Power Reserve
38h
41h
Jewels
26
24
Complications
None
GMT, Date

Pricing

1 specs
MSRP
$3,520
$299

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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.

Seestern S450 Ocean Star

Owners widely praise the Seestern S450 Ocean Star's Yachtmaster-style case and flawless bracelet finishing, with one owner noting the ST2130 movement keeps good time. The bezel action is described as having individual notches but feeling like a friction bezel, while another owner flags the bezel and crown action as smooth with perfect alignment. Lume is a point of contention, with one source describing it as a nice cool blue with ice-white application, while others note it as weak or not matching Prospex standards, despite using BGW-9. The watch is considered a "big boy" ideal for larger wrists (19cm+), potentially too large for 17cm wrists due to its size and non-tapering bracelet. Overall, owners rate the Seestern S450 Ocean Star highly for its build quality and finishing at the price point, despite some reservations about its size and lume intensity.

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