Which is cheaper, the Formex Reef 42 mm or the Sartory Billard SB10?

At MSRP the Formex Reef 42 mm is the cheaper of the two at $2,414, against $3,800 for the Sartory Billard SB10 — a $1,386 gap before any retailer discounting.

Which is bigger, the Formex Reef 42 mm or the Sartory Billard SB10?

The Formex Reef 42 mm wears larger at 42mm versus 39.5mm for the Sartory Billard SB10 — a 2.5mm difference across the dial.

Which has better water resistance, the Formex Reef 42 mm or the Sartory Billard SB10?

The Formex Reef 42 mm is rated to 300m versus 80m for the Sartory Billard SB10.

Which has a longer power reserve, the Formex Reef 42 mm or the Sartory Billard SB10?

The Formex Reef 42 mm carries a 56-hour power reserve against 55 hours on the Sartory Billard SB10.

What movement does the Formex Reef 42 mm run compared to the Sartory Billard SB10?

Both watches run automatic movements — the Formex Reef 42 mm uses the Sellita SW300-1 and the Sartory Billard SB10 uses the LJP G100.

Side by side

Formex Reef 42 mmvsSartory Billard SB10

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 SB10

MSRP $3,800

At a glance

11 of 29 specs differ

Diameter

Reef 42 mm42mm

SB1039.5mm

Power Reserve

Reef 42 mm56h

SB1055h

Water Resistance

Reef 42 mm300m

SB1080m

MSRP

Reef 42 mm$2,414

SB10$3,800

Full specifications

Case

6 specs

Crystal & Dial

1 specs

Lume

Super-LumiNova

Super-LumiNova BGW9

Movement

3 specs

Caliber

Sellita SW300-1

LJP G100

Power Reserve

56h

55h

Complications

None

Jumping Hour

Pricing

1 specs

MSRP

$2,414

$3,800

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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 Sartory Billard SB10 features a unique jumping hour and perimeter hour ring design, with functional grater plates that are not practical for actual grating due to a blocked-off side. Owners note the absence of a seconds hand, minute tick marks, and a conventional crystal. On balance, owners appreciate the unique design elements of the Sartory Billard SB10, despite its impractical features.

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