Side by side

Fortis Marinemaster M-40vsLongines HYDROCONQUEST GMT

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
HYDROCONQUEST GMT
LonginesHYDROCONQUEST GMT
MSRP $3,350

At a glance

9 of 29 specs differ
Diameter
Marinemaster M-4040mm
HYDROCONQUEST GMT43mm
Power Reserve
Marinemaster M-4038h
HYDROCONQUEST GMT72h
Water Resistance
Marinemaster M-40300m
HYDROCONQUEST GMT300m
MSRP
Marinemaster M-40$3,520
HYDROCONQUEST GMT$3,350

Full specifications

Case

4 specs
Diameter
40mm
43mm
Thickness
13mm
12.9mm
Lug-to-Lug
52mm
Lug Width
21mm
22mm

Crystal & Dial

1 specs
Dial Color
Orange
Green

Movement

3 specs
Caliber
Sellita SW220-1
L844.5
Power Reserve
38h
72h
Jewels
26
25

Pricing

1 specs
MSRP
$3,520
$3,350

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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.

Longines HYDROCONQUEST GMT

The Longines HYDROCONQUEST GMT is widely praised for its excellent finishing, with some comparing it favorably to higher-end dive watches, and its attractive blue sunburst dial. Owners note its practical true GMT complication and robust 41mm brushed case with ceramic bezel, powered by a movement offering a 72-hour power reserve. Some in the community find the round markers at 6 and 9 disrupt dial symmetry, though others appreciate this design element. A common criticism is the difficulty in reading the tiny GMT text beneath the hour markers, and the absence of a quick date adjust feature. One owner reported a sharp feeling on the bracelet's clasp, and another flagged mismatched date wheel colors on certain dial variants. Overall, owners and reviewers consider the Longines HYDROCONQUEST GMT a strong value proposition for a traveler's dive watch, citing its build quality and GMT functionality as key strengths.

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