Which is cheaper, the Formex Reef 42 mm or the Zelos Comet 39?

At MSRP the Formex Reef 42 mm is the cheaper of the two at $2,414, against $2,499 for the Zelos Comet 39 — a $85 gap before any retailer discounting.

Which is bigger, the Formex Reef 42 mm or the Zelos Comet 39?

The Formex Reef 42 mm wears larger at 42mm versus 39mm for the Zelos Comet 39 — a 3mm difference across the dial.

Which has better water resistance, the Formex Reef 42 mm or the Zelos Comet 39?

The Formex Reef 42 mm is rated to 300m versus 50m for the Zelos Comet 39.

Which has a longer power reserve, the Formex Reef 42 mm or the Zelos Comet 39?

The Formex Reef 42 mm carries a 56-hour power reserve against 40 hours on the Zelos Comet 39.

What movement does the Formex Reef 42 mm run compared to the Zelos Comet 39?

The Formex Reef 42 mm runs a automatic caliber (Sellita SW300-1), while the Zelos Comet 39 runs a manual (ETA/Peseux 7001).

Side by side

Formex Reef 42 mmvsZelos Comet 39

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

Formex Reef 42 mm

reef-42mm-automatic-cosc-300m-black

MSRP $2,414

Zelos Comet 39

zelos-comet-39

MSRP $2,499

At a glance

14 of 29 specs differ

Diameter

Reef 42 mm42mm

Comet 3939mm

Power Reserve

Reef 42 mm56h

Comet 3940h

Water Resistance

Reef 42 mm300m

Comet 3950m

MSRP

Reef 42 mm$2,414

Comet 39$2,499

Full specifications

Case

7 specs

Crystal & Dial

3 specs

Crystal

Sapphire

Domed Sapphire

Dial Color

Black

Tantalum LE

Lume

Super-LumiNova

None

Movement

3 specs

Caliber

Sellita SW300-1

ETA/Peseux 7001

Type

Automatic

Manual

Power Reserve

56h

40h

Pricing

1 specs

MSRP

$2,414

$2,499

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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.

Owners widely praise the Zelos Comet 39 for its wearable 39mm size, thin profile under 10mm thanks to its manual-wind Sellita SW215 movement, and its captivating dial with a deep starburst effect. The winding action is described as a joy, and the watch is considered a stunner for its price, blending modern and vintage aesthetics. Some owners note frustration with Zelos's limited production runs leading to quick sell-outs. One owner found the logo childlike, while another experienced strap-rubbing issues with the short lugs, which were resolved with a Milanese bracelet. Overall, owners and reviewers rate the Zelos Comet 39 highly for its excellent value and striking dial design.

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