Side by side

Formex Reef 39.5 mmvsLongines HYDROCONQUEST

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
LonginesHYDROCONQUEST
MSRP $2,350

At a glance

9 of 29 specs differ
Diameter
Reef 39.5 mm39.5mm
HYDROCONQUEST39mm
Power Reserve
Reef 39.5 mm56h
HYDROCONQUEST40h
Water Resistance
Reef 39.5 mm300m
HYDROCONQUEST300m
MSRP
Reef 39.5 mm$2,230
HYDROCONQUEST$2,350

Full specifications

Case

4 specs
Diameter
39.5mm
39mm
Thickness
11mm
12.2mm
Lug-to-Lug
45.5mm
48.1mm
Lug Width
22mm
19mm

Crystal & Dial

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

Movement

2 specs
Caliber
Sellita SW300-1
L888.5
Power Reserve
56h
40h

Pricing

1 specs
MSRP
$2,230
$2,350

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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

Owners widely praise the Longines HydroConquest's dial and finishing, with one owner finding it superior to a Rolex Submariner. The movement is noted as well-regulated, losing about 2 seconds per day. The watch is considered a versatile everyday or business-casual option, offering good value. However, owners criticize the bracelet for lacking tool-less micro-adjustment and describe winding the crown as a nuisance. Some in the line report tiny GMT markers that are difficult to read and the absence of a quick date adjust feature. Overall, owners rate the Longines HydroConquest highly for its finishing and value.

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