Which is bigger, the Formex Reef 42 mm or the Sartory Billard SB05?

The Formex Reef 42 mm wears larger at 42mm versus 38.5mm for the Sartory Billard SB05 — a 3.5mm difference across the dial.

Which has better water resistance, the Formex Reef 42 mm or the Sartory Billard SB05?

The Formex Reef 42 mm is rated to 300m versus 50m for the Sartory Billard SB05.

Which has a longer power reserve, the Formex Reef 42 mm or the Sartory Billard SB05?

The Sartory Billard SB05 carries a 90-hour power reserve against 56 hours on the Formex Reef 42 mm.

What movement does the Formex Reef 42 mm run compared to the Sartory Billard SB05?

The Formex Reef 42 mm runs a automatic caliber (Sellita SW300-1), while the Sartory Billard SB05 runs a manual (LJP Cal. 7380).

Side by side

Formex Reef 42 mmvsSartory Billard SB05

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

Sartory Billard SB05

At a glance

11 of 29 specs differ

Diameter

Reef 42 mm42mm

SB0538.5mm

Power Reserve

Reef 42 mm56h

SB0590h

Water Resistance

Reef 42 mm300m

SB0550m

MSRP

Reef 42 mm$2,414

SB05—

Full specifications

Case

6 specs

Crystal & Dial

1 specs

Lume

Super-LumiNova

None

Movement

3 specs

Caliber

Sellita SW300-1

LJP Cal. 7380

Type

Automatic

Manual

Power Reserve

56h

90h

Pricing

1 specs

MSRP

$2,414

—

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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.

The dial's Maki-e Raden and aventurine combination is a standout feature. The 38.5mm case size and slim profile are noted for comfort.

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