Which is cheaper, the Formex Reef 39.5 mm or the Formex Stratos UTC?

At MSRP the Formex Reef 39.5 mm is the cheaper of the two at $2,230, against $4,663 for the Formex Stratos UTC — a $2,433 gap before any retailer discounting.

Which is bigger, the Formex Reef 39.5 mm or the Formex Stratos UTC?

The Formex Stratos UTC wears larger at 41mm versus 39.5mm for the Formex Reef 39.5 mm — a 1.5mm difference across the dial.

Which has better water resistance, the Formex Reef 39.5 mm or the Formex Stratos UTC?

The Formex Reef 39.5 mm is rated to 300m versus 100m for the Formex Stratos UTC.

Which has a longer power reserve, the Formex Reef 39.5 mm or the Formex Stratos UTC?

The Formex Reef 39.5 mm carries a 56-hour power reserve against 42 hours on the Formex Stratos UTC.

What movement does the Formex Reef 39.5 mm run compared to the Formex Stratos UTC?

Both watches run automatic movements — the Formex Reef 39.5 mm uses the Sellita SW300-1 and the Formex Stratos UTC uses the ETA 2892.

Side by side

Formex Reef 39.5 mmvsFormex Stratos UTC

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

Formex Reef 39.5 mm

reef-39.5-automatic-chronometer-cosc-300m-bahama-blue

MSRP $2,230

Formex Stratos UTC

stratos-41mm-utc-automatic-blue

MSRP $4,663

At a glance

10 of 29 specs differ

Diameter

Reef 39.5 mm39.5mm

Stratos UTC41mm

Power Reserve

Reef 39.5 mm56h

Stratos UTC42h

Water Resistance

Reef 39.5 mm300m

Stratos UTC100m

MSRP

Reef 39.5 mm$2,230

Stratos UTC$4,663

Full specifications

Case

6 specs

Crystal & Dial

1 specs

Dial Color

Bahama Blue

Blue

Movement

2 specs

Caliber

Sellita SW300-1

ETA 2892

Power Reserve

56h

42h

Pricing

1 specs

MSRP

$2,230

$4,663

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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.

Owners and reviewers widely praise the Formex Stratos UTC for its user-friendly flyer GMT complication, which utilizes pushers for time-zone adjustments, and its slim 11.8mm case. The watch is noted for its intricate, hand-finished case with a multi-layer construction and excellent finishing, along with a unique two-level case design. The Dubois-Depraz module on an ETA 2892 movement is a highlight, with accuracy figures ranging from +/- 5 to +/- 7 seconds per day. However, some find the dial busy with multiple typefaces and the overall design too complex or "plug ugly," with the price near €4000 considered high by some for a newer brand. Overall, owners and reviewers rate the Formex Stratos UTC highly for its innovative GMT functionality and excellent case finishing at its price point.

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