Side by side

Serket Watch Co Reef MarianavsSeiko Prospex Land Mechanical GMT

The numbers, the dial colors, the calibers — laid out so you can stop flipping between tabs.

Reef Mariana
Serket Watch CoReef Mariana
MSRP $449
Prospex Land Mechanical GMT
SeikoProspex Land Mechanical GMT
MSRP $1,150
What people say

Owners + reviewers, side by side

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

Serket Watch Co Reef Mariana

Owners widely praise the Serket Watch Co Reef Mariana for its significant value, citing the sapphire crystal, ceramic bezel, and NH35 automatic movement at its price point. Some owners note the bezel turns too easily and suggest the lume could be improved. On balance, owners rate the Serket Watch Co Reef Mariana highly for its bold aesthetic and strong feature set at the price.

Seiko Prospex Land Mechanical GMT

Owners widely praise the Seiko Prospex Land Mechanical GMT for its faithful reconstruction of a classic design, comfortable bracelet, and attractive gray dial with a bubbly crystal. Reviewers highlight its handsome everyday sports watch appeal, solid specifications, and classic Seiko diver aesthetics, offering great value. However, community members are divided on the 6R movement's accuracy, with some reporting significant deviations even after regulation, while others find it competitive for the price. A point of contention is the GMT function, with some wishing for a "flyer" style local jump GMT instead of the "caller" type, and the internal compass bezel is described as finicky and difficult to read. Owners generally consider the Seiko Prospex Land Mechanical GMT overpriced at its retail price, suggesting better value is found on sale or closer to $700.

At a glance

12 of 29 specs differ
Diameter
Reef Mariana40mm
Prospex Land Mechanical GMT39.5mm
Power Reserve
Reef Mariana
Prospex Land Mechanical GMT72h
Water Resistance
Reef Mariana200m
Prospex Land Mechanical GMT200m
MSRP
Reef Mariana$449
Prospex Land Mechanical GMT$1,150

Full specifications

Case

4 specs
Category
GMT
Diameter
40mm
39.5mm
Thickness
13.2mm
13.6mm
Lug-to-Lug
47.5mm
46.4mm

Crystal & Dial

4 specs
Crystal Shape
Flat
Curved
AR Coating
Inner
Anti-reflective coating on inner surface
Dial Color
Orange
Black
Lume
BGW9
LumiBrite on hands and index(es)

Movement

3 specs
Caliber
Seiko NH35
6R54
Power Reserve
72h
Jewels
25
24

Pricing

1 specs
MSRP
$449
$1,150
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