Side by side

Formex Reef 39.5 mmvsLongines MASTER COLLECTION

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
MASTER COLLECTION
LonginesMASTER COLLECTION
MSRP $3,100

At a glance

20 of 29 specs differ
Diameter
Reef 39.5 mm39.5mm
MASTER COLLECTION42mm
Power Reserve
Reef 39.5 mm56h
MASTER COLLECTION
Water Resistance
Reef 39.5 mm300m
MASTER COLLECTION30m
MSRP
Reef 39.5 mm$2,230
MASTER COLLECTION$3,100

Full specifications

Case

8 specs
Category
Diver
Diameter
39.5mm
42mm
Thickness
11mm
9.64mm
Lug-to-Lug
45.5mm
49.6mm
Lug Width
22mm
21mm
Finish
Brushed and polished
Water Resistance
300m
30m
Caseback
Solid

Crystal & Dial

5 specs
Crystal Shape
Flat
AR Coating
Inner
Dial Color
Bahama Blue
Silver
Indices
Applied
Lume
Super-LumiNova
None

Movement

6 specs
Caliber
Sellita SW300-1
L888.5
Beat Rate
28,800 vph
0 vph
Power Reserve
56h
0h
Jewels
25
0
Hacking
Yes
No
Hand-winding
Yes
No

Pricing

1 specs
MSRP
$2,230
$3,100

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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 MASTER COLLECTION

Owners and reviewers widely praise the Longines Master Collection for its excellent fit and finish, heritage-inspired design with features like Breguet numerals and leaf hands, and the value it offers, particularly for complications like chronographs and annual calendars. Specific models are noted for their beautiful dial execution, creamy white barleycorn or blue starburst finishes, and practical complications. Some owners find the Master Collection thin and dressy, appreciating its vintage aesthetic. However, drawbacks mentioned include a subdial potentially obscuring numerals, a bracelet lacking micro-adjustments causing fit issues for some, and a case finishing described as homogenous by one owner. The 30m water resistance on annual calendar models is considered light, and the crown and pushers on the moon phase chronograph are described as uninspiring. One owner reported a broken moon phase setting mechanism.

From video reviewers

The diamond hour markers are a notable strength. The movement accuracy was not discussed.

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