Side by side

Formex Reef 39.5 mmvsLongines HYDROCONQUEST GMT

The numbers, the dial colors, the calibers — laid out so you can stop flipping between tabs.

Reef 39.5 mm
FormexReef 39.5 mm
MSRP $2,230
HYDROCONQUEST GMT
LonginesHYDROCONQUEST GMT
MSRP $3,350

At a glance

9 of 29 specs differ
Diameter
Reef 39.5 mm39.5mm
HYDROCONQUEST GMT41mm
Power Reserve
Reef 39.5 mm56h
HYDROCONQUEST GMT40h
Water Resistance
Reef 39.5 mm300m
HYDROCONQUEST GMT300m
MSRP
Reef 39.5 mm$2,230
HYDROCONQUEST GMT$3,350

Full specifications

Case

4 specs
Diameter
39.5mm
41mm
Thickness
11mm
12.9mm
Lug-to-Lug
45.5mm
49.4mm
Lug Width
22mm
21mm

Crystal & Dial

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

Movement

2 specs
Caliber
Sellita SW300-1
L844.5
Power Reserve
56h
40h

Pricing

1 specs
MSRP
$2,230
$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.

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.

Longines HYDROCONQUEST GMT

Owners widely praise the Longines HYDROCONQUEST GMT for its excellent finishing, smooth winding action, and overall value, with some finding its build quality and colorways superior to higher-priced competitors. Reviewers and owners alike note its robustness as a traveler's dive watch with a true GMT movement. Some owners find the round markers at 6 and 9 disrupt dial symmetry, and the GMT hour markers are described as tiny and difficult to read. The date wheel can be mismatched on certain dial colors, and the bracelet clasp is noted as sharp by one reviewer. While some owners wish for a smaller case size, others find the 41mm comfortable. The bezel action is flagged as having bounce-back by one owner, though the brushed finish effectively hides wear. Overall, owners and reviewers rate the Longines HYDROCONQUEST GMT highly for its robust build and excellent value proposition.

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