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Serket Watch Co Reef MarianavsSeiko Prospex SPEEDTIMER Mechanical

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

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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.

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 SPEEDTIMER Mechanical

The Seiko Prospex SPEEDTIMER Mechanical is praised for its visually appealing design and comfortable wearability, with owners frequently using its chronograph function for daily tasks. Reviewers note its clean dial layout and LumiBrite treated hands and markers, and one source highlights the 72-hour power reserve of the 6R55 movement. However, some owners criticize its chronograph functionality and the 24-hour subdial. On balance, owners and reviewers rate the Seiko Prospex SPEEDTIMER Mechanical highly for its daily usability and refined aesthetics.

At a glance

12 of 29 specs differ
Diameter
Reef Mariana40mm
Prospex SPEEDTIMER Mechanical39.5mm
Power Reserve
Reef Mariana
Prospex SPEEDTIMER Mechanical72h
Water Resistance
Reef Mariana200m
Prospex SPEEDTIMER Mechanical200m
MSRP
Reef Mariana$449
Prospex SPEEDTIMER Mechanical$995

Full specifications

Case

4 specs
Category
Chronograph
Diameter
40mm
39.5mm
Thickness
13.2mm
12mm
Lug-to-Lug
47.5mm
44.5mm

Crystal & Dial

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

Movement

3 specs
Caliber
Seiko NH35
Seiko 6R55
Power Reserve
72h
Jewels
0
24

Pricing

1 specs
MSRP
$449
$995
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