Side by side

Formex Reef 39.5 mmvsGrand Seiko SBGX353

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
SBGX353
Grand SeikoSBGX353
MSRP $4,100

At a glance

13 of 29 specs differ
Diameter
Reef 39.5 mm39.5mm
SBGX35334mm
Power Reserve
Reef 39.5 mm56h
SBGX35340h
Water Resistance
Reef 39.5 mm300m
SBGX35330m
MSRP
Reef 39.5 mm$2,230
SBGX353$4,100

Full specifications

Case

6 specs
Category
Diver
Dress
Diameter
39.5mm
34mm
Thickness
11mm
10.7mm
Lug-to-Lug
45.5mm
41.5mm
Lug Width
22mm
18mm
Water Resistance
300m
30m

Crystal & Dial

3 specs
AR Coating
Inner
Yes
Dial Color
Bahama Blue
Black
Lume
Super-LumiNova
None

Movement

3 specs
Caliber
Sellita SW300-1
9F61
Type
Automatic
Quartz
Power Reserve
56h
40h

Pricing

1 specs
MSRP
$2,230
$4,100

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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.

Grand Seiko SBGX353

The Grand Seiko SBGX353 is widely praised for its mesmerizing "Skyflake" textured blue dial, considered by owners to be "perfect art." Reviewers and owners alike highlight the watch's elegant 34mm case size and the advanced 9F61 quartz movement, noting its exceptional ±10 seconds per year accuracy and precise second-hand alignment. Some owners find the dial's aesthetic appeal slightly diminished when worn compared to other options, and one owner replaced the quick-release buckle for a Hirsch clasp. Overall, owners rate the Grand Seiko SBGX353 highly for its exquisite dial finishing and the precision of its quartz movement at its price point.

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