Side by side

Formex Reef 39.5 mmvsSpinnaker Challenger Automatic

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
Challenger Automatic
SpinnakerChallenger Automatic
MSRP $289

At a glance

10 of 29 specs differ
Diameter
Reef 39.5 mm39.5mm
Challenger Automatic42mm
Power Reserve
Reef 39.5 mm56h
Challenger Automatic40h
Water Resistance
Reef 39.5 mm300m
Challenger Automatic200m
MSRP
Reef 39.5 mm$2,230
Challenger Automatic$289

Full specifications

Case

5 specs
Diameter
39.5mm
42mm
Thickness
11mm
19mm
Lug-to-Lug
45.5mm
49.5mm
Material
Stainless Steel
316L Stainless Steel
Water Resistance
300m
200m

Crystal & Dial

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

Movement

2 specs
Caliber
Sellita SW300-1
SII NH35A
Power Reserve
56h
40h

Pricing

1 specs
MSRP
$2,230
$289

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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.

Spinnaker Challenger Automatic

The Spinnaker Challenger Automatic is widely praised for its fun, playful design, solid build quality, and satisfying bezel action. Owners appreciate the comfortable 42mm DLC-coated case and the thoughtful integration of the Popeye theme, with the character serving as the hour and minute hands. Reviewers note the reliable Seiko NH35 movement and 300m water resistance. Some owners find the blue lume weaker than expected, and the ultra-domed sapphire crystal presents challenges for photography. The thick rubber strap is also cited as difficult to manage. Overall, owners and reviewers rate the Spinnaker Challenger Automatic highly for its unique character integration and solid dive watch fundamentals at its price point.

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