Side by side

Formex Reef 39.5 mmvsLongines LONGINES AVIGATION BIGEYE

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
LONGINES AVIGATION BIGEYE
LonginesLONGINES AVIGATION BIGEYE
MSRP $4,400

At a glance

11 of 29 specs differ
Diameter
Reef 39.5 mm39.5mm
LONGINES AVIGATION BIGEYE41mm
Power Reserve
Reef 39.5 mm56h
LONGINES AVIGATION BIGEYE40h
Water Resistance
Reef 39.5 mm300m
LONGINES AVIGATION BIGEYE30m
MSRP
Reef 39.5 mm$2,230
LONGINES AVIGATION BIGEYE$4,400

Full specifications

Case

6 specs
Category
Diver
Chronograph
Diameter
39.5mm
41mm
Thickness
11mm
14.5mm
Lug-to-Lug
45.5mm
48.7mm
Lug Width
22mm
20mm
Water Resistance
300m
30m

Crystal & Dial

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

Movement

2 specs
Caliber
Sellita SW300-1
L688.5
Power Reserve
56h
40h

Pricing

1 specs
MSRP
$2,230
$4,400

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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 AVIGATION BIGEYE

Owners and reviewers widely praise the Longines Avigation Bigeye for its unique, asymmetric dial, vintage military aesthetic, and cohesive design, with one reviewer noting its GPHG Best Revival prize win. The tactile chronograph pusher action and reliable L688.2 column wheel movement are highlighted, as is the watch's legibility and versatile strap-swapping potential due to its 20mm lug width. However, criticisms include the 30-minute sub-dial's three-minute hash marks, which some find compromise reading speed, and the lack of drilled lugs. The watch's thickness, around 14.45mm, is noted as typical for its movement, and some owners mention minor QC issues with chronograph hand alignment and a loud rotor. On balance, owners and reviewers rate the Longines Avigation Bigeye highly for its distinctive vintage-inspired design and solid chronograph performance at its price point.

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