Side by side

Formex Reef 42 mmvsSeiko Prospex Sea JAWS 50th Anniversary Limited Edition

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.

Formex Reef 42 mm

The Formex Reef 42 mm is widely praised for its comfortable bracelet featuring a micro-adjust clasp, COSC-certified Sellita movement, and excellent build quality. Owners appreciate the gradient dial's visual appeal and the overall wearability. Some owners note the seconds hand does not perfectly align with markers, and one owner found the lugs' taper hinders third-party strap fit. The bracelet's length and sporty design are noted as limiting versatility by some. On balance, owners and reviewers rate the Formex Reef 42 mm highly for its impressive wearability and value at the price point.

Seiko Prospex Sea JAWS 50th Anniversary Limited Edition

The Seiko Prospex Sea JAWS 50th Anniversary Limited Edition is praised for its well-executed movie homage, featuring a striking silver-to-blue gradient dial with a hidden shark design and the "JAWS" logo. Owners note the special case back marked with the Orca boat and shark fin, and the inclusion of a special box. The watch is considered a fun summer piece, with a comfortable blue silicone strap, despite its 45mm dimensions. The 4R36 automatic movement is noted to have a 41-hour power reserve, with accuracy reported between +45 and -35 seconds per day. On balance, owners and reviewers appreciate the Seiko Prospex Sea JAWS 50th Anniversary Limited Edition for its unique Jaws-themed dial and commemorative details.

At a glance

11 of 29 specs differ
Diameter
Reef 42 mm42mm
Prospex Sea JAWS 50th Anniversary Limited Edition45mm
Power Reserve
Reef 42 mm56h
Prospex Sea JAWS 50th Anniversary Limited Edition41h
Water Resistance
Reef 42 mm300m
Prospex Sea JAWS 50th Anniversary Limited Edition200m
MSRP
Reef 42 mm$2,414
Prospex Sea JAWS 50th Anniversary Limited Edition$795

Full specifications

Case

4 specs
Diameter
42mm
45mm
Thickness
11.4mm
13.2mm
Lug-to-Lug
47mm
47.7mm
Water Resistance
300m
200m

Crystal & Dial

3 specs
AR Coating
Anti-reflective coating on inner surface
Dial Color
Black
Lume
Super-LumiNova
LumiBrite on hands, index(es) and bezel

Movement

3 specs
Caliber
Sellita SW300-1
Seiko 4R36
Power Reserve
56h
41h
Jewels
0
24

Pricing

1 specs
MSRP
$2,414
$795
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