Formex Reef GMTvsSeiko Prospex Land Mechanical GMT

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Measurements

Catalog photos are all shot at the same flattering size. These aren't: every case below shares one millimeter scale.

Formex Reef GMT at true scale

Reef GMT

Seiko Prospex Land Mechanical GMT at true scale

Prospex Land Mechanical GMT

Diameter

42mm

39.5mm

Lug-to-Lug

47mm

46.4mm

lowest

Thickness

11.4mm

lowest

13.6mm

Water Resistance

300m

highest

200m

Power Reserve

56h

72h

highest

MSRP

$2,235

$1,150

lowest

Movement

Sellita SW330-2

Seiko 6R54

Case

5 specs
Diameter
42mm
39.5mm
Thickness
11.4mm
13.6mm
Lug-to-Lug
47mm
46.4mm
Lug Width
22mm
20mm
Water Resistance
300m
200m

Crystal & Dial

4 specs
Crystal Shape
n/a
Curved
AR Coating
n/a
Anti-reflective coating on inner surface
Dial Color
Black
n/a
Lume
Super-LumiNova
LumiBrite on hands and index(es)

Movement

3 specs
Caliber
Sellita SW330-2
Seiko 6R54
Power Reserve
56h
72h
Jewels
0
24

Pricing

1 specs
MSRP
$2,235
$1,150
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Reviews

Synthesized for each watch independently from owner discussions, enthusiast forums, written reviews, and video reviewers.

Formex Reef GMT

Owners and reviewers widely praise the Formex Reef GMT for its impressive specifications and value, highlighting its unique porthole case shape and comfortable quick-release bracelet with on-the-fly micro-adjustment. The COSC-certified Sellita SW330-2 movement is noted for good finishing and reliable timekeeping, with a 56-hour power reserve. However, the watch's overall width and lug-to-lug span, particularly with male endlinks, are frequently cited as being too large for smaller wrists. Some reviewers also find the bezel action stiff and slippery, and the GMT model lacks a timing bezel option with lume. Overall, owners and reviewers rate the Formex Reef GMT highly for its robust construction and excellent specs at its price point.

From video reviewers

The watch features a COSC-certified SW330-2 GMT movement, which is visible through a sapphire crystal display case back and beautifully decorated. The watch's water-resistance of up to 300m/1000ft is a notable feature. The 42mm diameter may be too large for smaller wrists.

Seiko Prospex Land Mechanical GMT

Owners widely praise the Seiko Prospex Land Mechanical GMT for its faithful reconstruction of the 6117 design, its attractive gray dial, and comfortable bracelet. Reviewers highlight its handsome everyday sports watch appeal and classic Seiko diver aesthetics. However, community members are split on the value proposition, with many deeming it overpriced at $970, suggesting a better price point around $700 or on sale. Some owners criticize the 6R54 movement's accuracy, reporting deviations of up to +/- 20 seconds per day, and prefer a local jumping GMT function over the caller style. On balance, owners and reviewers appreciate the Seiko Prospex Land Mechanical GMT's design and wearability, but opinions are divided on its price and movement performance relative to alternatives.

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