Which is cheaper, the Fortis Flieger F-41 Werk 7 or the Sartory Billard SB04?

At MSRP the Sartory Billard SB04 is the cheaper of the two at $2,900, against $4,510 for the Fortis Flieger F-41 Werk 7 — a $1,610 gap before any retailer discounting.

Which is bigger, the Fortis Flieger F-41 Werk 7 or the Sartory Billard SB04?

The Fortis Flieger F-41 Werk 7 wears larger at 41mm versus 40mm for the Sartory Billard SB04 — a 1mm difference across the dial.

Which has better water resistance, the Fortis Flieger F-41 Werk 7 or the Sartory Billard SB04?

The Fortis Flieger F-41 Werk 7 is rated to 200m versus 30m for the Sartory Billard SB04.

Which has a longer power reserve, the Fortis Flieger F-41 Werk 7 or the Sartory Billard SB04?

The Sartory Billard SB04 carries a 40-hour power reserve against 38 hours on the Fortis Flieger F-41 Werk 7.

What movement does the Fortis Flieger F-41 Werk 7 run compared to the Sartory Billard SB04?

Both watches run automatic movements — the Fortis Flieger F-41 Werk 7 uses the Werk 7 (Manufacture) and the Sartory Billard SB04 uses the LJP G100.

Side by side

Fortis Flieger F-41 Werk 7vsSartory Billard SB04

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

Fortis Flieger F-41 Werk 7

F-41 Werk 7

MSRP $4,510

Sartory Billard SB04

MSRP $2,900

At a glance

9 of 29 specs differ

Diameter

Flieger F-41 Werk 741mm

SB0440mm

Power Reserve

Flieger F-41 Werk 738h

SB0440h

Water Resistance

Flieger F-41 Werk 7200m

SB0430m

MSRP

Flieger F-41 Werk 7$4,510

SB04$2,900

Full specifications

Case

4 specs

Crystal & Dial

1 specs

AR Coating

Inner

Yes

Movement

3 specs

Caliber

Werk 7 (Manufacture)

LJP G100

Power Reserve

38h

40h

Jewels

Pricing

1 specs

MSRP

$4,510

$2,900

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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.

Fortis Flieger F-41 Werk 7

The Fortis Flieger is widely praised for its robust build quality, superb readability, and excellent fit and finish, with reviewers highlighting the utilitarian dial and Brixtrack markers. Some find the 39mm case wears large due to its 50mm lug-to-lug span, while others note the 41mm versions offer better proportions. The Werk 7 movement provides a 70-hour power reserve, though one review mentions the UW-30 movement in a 39mm model has a 38-hour power reserve. On balance, reviewers rate the Fortis Flieger highly for its practical design and solid construction at its price point.

The dial's textured finish and color shift are highlighted as a key strength. The bracelet's perceived lack of refinement and end-link fit are noted as a drawback. Reviewers disagree on the case size, with mentions of 35.9mm and 40mm.

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