Side by side

Formex Reef 39.5 mmvsSeiko Prospex LX line

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

Reef 39.5 mm
FormexReef 39.5 mm
MSRP $2,230
Prospex LX line
SeikoProspex LX line
MSRP $6,500

At a glance

12 of 29 specs differ
Diameter
Reef 39.5 mm39.5mm
Prospex LX line44.8mm
Power Reserve
Reef 39.5 mm56h
Prospex LX line72h
Water Resistance
Reef 39.5 mm300m
Prospex LX line300m
MSRP
Reef 39.5 mm$2,230
Prospex LX line$6,500

Full specifications

Case

4 specs
Diameter
39.5mm
44.8mm
Thickness
11mm
15.7mm
Lug-to-Lug
45.5mm
50.9mm
Material
Stainless Steel
Titanium

Crystal & Dial

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

Movement

4 specs
Caliber
Sellita SW300-1
5R65
Type
Automatic
Spring Drive
Power Reserve
56h
72h
Jewels
25
30

Pricing

1 specs
MSRP
$2,230
$6,500

Follow this matchup

Get a note when Formex Reef 39.5 mm vs Seiko Prospex LX line gets more votes, a community discussion, or a price drop. No account needed.

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 39.5 mm

The Formex Reef 39.5 mm is widely praised for its refined finishing, comfortable and well-proportioned case design, and impressive specifications for its price point, including COSC-certified Sellita SW300-1 movement and 300m water resistance. Owners and reviewers highlight the tool-less micro-adjust clasp and quick-release spring bars as practical features. Some reviewers note that the 22mm lug width feels slightly disproportionate to the smaller case, and the bracelet could benefit from more taper, though this is a point of contention for some owners who value the overall package. A prototype crown protrusion issue is noted as being addressed for production. On balance, owners and reviewers rate the Formex Reef 39.5 mm highly for its excellent value and well-executed design.

Seiko Prospex LX line

Owners widely report the Seiko Prospex LX line's finishing is a step up from other models, with a case that sits well on the wrist, and some praise the green sunburst dial with blue anti-reflective sapphire crystal as phenomenal. However, owners note the high MSRP limited sales, with some desiring smaller cases and a reduced price, and others experienced quality control issues such as detached second hands and peeling DLC coating, leading to concerns about fragility. On balance, owners feel the Seiko Prospex LX line was discontinued due to pricing that alienated its target market, despite its attractive dial.

Keep exploring

More watches worth a look

Matched to the watches above on size, movement, style and price — microbrands first. Open any one to dig in.

Adjacent matchups

People also compared

Comparisons nearby in the catalog — alternatives to the watches above paired against the matchup.