Side by side

Peren OnevsFormex Reef GMT

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

One
PerenOne
MSRP $449
Reef GMT
FormexReef GMT
MSRP $2,235

At a glance

12 of 29 specs differ
Diameter
One40.6mm
Reef GMT42mm
Power Reserve
One
Reef GMT56h
Water Resistance
One200m
Reef GMT300m
MSRP
One$449
Reef GMT$2,235

Full specifications

Case

6 specs
Category
GMT
Diameter
40.6mm
42mm
Thickness
12mm
11.4mm
Lug-to-Lug
46mm
47mm
Lug Width
22mm
Water Resistance
200m
300m

Crystal & Dial

2 specs
Dial Color
Dark Blue
Black
Lume
None
Super-LumiNova

Movement

3 specs
Caliber
Seiko VK64
Sellita SW330-2
Type
Quartz
Automatic
Power Reserve
56h

Pricing

1 specs
MSRP
$449
$2,235

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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.

Peren One

The Peren One chronograph is praised for its blend of minimalist and retro styling, featuring a clean bi-compax dial with applied indices and diamond-cut hands. Reviewers note its detailed dial execution, thoughtful case and bracelet finishing, and the use of applied Globolight markers with BGW9 Super-LumiNova. The watch utilizes a Seiko VK64 mecha-quartz movement, offering quartz accuracy with a mechanical chronograph feel, and boasts a 200-meter water resistance rating within its 40.6mm steel case. Overall, reviewers highlight the Peren One's strong value proposition driven by its design and finishing.

Formex Reef GMT

The Formex Reef GMT is widely praised for its unique porthole case shape, COSC-certified Sellita SW330-2 movement with good finishing, and comfortable quick-release bracelet with on-the-fly micro-adjustment. Reviewers note its robust construction, impressive specifications, and strong value proposition, with a slim 11.4mm profile accommodating 300m water resistance and an exhibition caseback. However, owners widely report the 53mm lug-to-lug span with male endlinks makes it too large for smaller wrists. Some find the bezel action stiff and potentially slippery, and a reviewer desired sharper finishing and edges, deeming the aesthetic too modernist. The GMT variant sacrifices a timing bezel unless swapped, and one owner notes sharp edges on the crown and crown guard. Overall, owners and reviewers highly rate the Formex Reef GMT for its exceptional value and well-executed features, particularly its bracelet system and COSC-certified movement.

From video reviewers

The watch features a COSC-certified SW330-2 GMT movement, which is visible through a sapphire crystal display case back and beautifully decorated. The watch's water-resistance of up to 300m/1000ft is a notable feature. The 42mm diameter may be too large for smaller wrists.

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