Side by side

Phoibos Reef MastervsSeiko Prospex Sea

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

Reef Master
PhoibosReef Master
MSRP $335
Prospex Sea
SeikoProspex Sea
MSRP $1,100

At a glance

11 of 29 specs differ
Diameter
Reef Master42mm
Prospex Sea41.3mm
Power Reserve
Reef Master40h
Prospex Sea72h
Water Resistance
Reef Master200m
Prospex Sea300m
MSRP
Reef Master$335
Prospex Sea$1,100

Full specifications

Case

5 specs
Diameter
42mm
41.3mm
Thickness
13mm
12.5mm
Lug-to-Lug
48mm
48.2mm
Lug Width
22mm
20mm
Water Resistance
200m
300m

Crystal & Dial

2 specs
AR Coating
Yes
Anti-reflective coating on inner surface
Lume
Super-LumiNova
LumiBrite on hands, index(es) and bezel

Movement

3 specs
Caliber
SII NH38
6R55
Power Reserve
40h
72h
Jewels
25
24

Pricing

1 specs
MSRP
$335
$1,100

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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.

Phoibos Reef Master

Owners widely praise the Phoibos Reef Master for its exceptional value, highlighting its sapphire crystal, DLC coating, and extensive BGW9 lume. The watch is noted for its cool lume, with one owner finding it not bulky despite its robust build. The Shamrock Green dial and texture are highly praised, as is the comfortable bracelet with solid end links. However, the bezel action is described as rough, and the basic folding clasp is a disappointment. Accuracy is reported as excellent, with one owner seeing +-2 sec/day. Some find the 42mm size almost too big for their wrists, and the date window is considered too small. Overall, owners rate the Phoibos Reef Master highly for its impressive feature set and value at its price point.

Seiko Prospex Sea

Seiko Prospex Sea models are widely praised for their excellent build quality, value for money, and comfortable wearability, with many appreciating the vintage-inspired designs and robust construction. Owners note the silicone straps are surprisingly comfortable and well-finished, and the Lumibrite lume is excellent. However, some find the 44.3mm size and thickness too large for smaller wrists, though others report the sizing as perfect. The 6R15 movement in some variants offers accuracy around +4 seconds per day with a 50-hour power reserve, while newer movements offer more. Some models are criticized for a bracelet width not matching the case size or a rudimentary clasp for their price point. Overall, owners and reviewers rate the Seiko Prospex Sea highly for its impressive case work and finishing at its price point.

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