Side by side

Formex Reef 39.5 mmvsTissot Seastar 1000 Powermatic 80 GMT

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
Seastar 1000 Powermatic 80 GMT
TissotSeastar 1000 Powermatic 80 GMT
MSRP $1,375

At a glance

12 of 29 specs differ
Diameter
Reef 39.5 mm39.5mm
Seastar 1000 Powermatic 80 GMT46mm
Power Reserve
Reef 39.5 mm56h
Seastar 1000 Powermatic 80 GMT80h
Water Resistance
Reef 39.5 mm300m
Seastar 1000 Powermatic 80 GMT300m
MSRP
Reef 39.5 mm$2,230
Seastar 1000 Powermatic 80 GMT$1,375

Full specifications

Case

4 specs
Category
Diver
GMT
Diameter
39.5mm
46mm
Thickness
11mm
15.4mm
Lug-to-Lug
45.5mm
46mm

Crystal & Dial

5 specs
Crystal Shape
Flat
Domed
AR Coating
Inner
Yes
Dial Color
Bahama Blue
Black
Indices
Applied
Indexes
Lume
Super-LumiNova
Super-LumiNova ®

Movement

2 specs
Caliber
Sellita SW300-1
Powermatic 80
Power Reserve
56h
80h

Pricing

1 specs
MSRP
$2,230
$1,375

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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 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.

Tissot Seastar 1000 Powermatic 80 GMT

Owners widely praise the Tissot Seastar 1000 Powermatic 80 GMT for its excellent build quality, smooth winding feel, and the reliable Powermatic 80 movement providing an 80-hour power reserve. Reviewers highlight its remarkable value under $700, comfortable wearability, and appealing case/dial ratio. Some owners note the bezel's functionality for tracking a second time zone and the need to adjust the hour hand for date setting, a characteristic of its "True" GMT function. The rubber strap is considered comparable to those found on significantly more expensive watches. However, concerns exist regarding the movement's serviceability due to potential plastic components and reliance on Swatch Group service centers. Some find the bezel font and dial spacing unappealing, while others question the mineral glass bezel insert as a cost-cutting measure compared to ceramic. Accuracy is generally reported as good, though not COSC certified, and lume intensity is described as average by one owner.

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