Side by side

Fortis Stratoliner S-41vsSeiko Prospex SPEEDTIMER

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

Stratoliner S-41
FortisStratoliner S-41
MSRP $5,450
Prospex SPEEDTIMER
SeikoProspex SPEEDTIMER
MSRP $725

At a glance

14 of 29 specs differ
Diameter
Stratoliner S-4141mm
Prospex SPEEDTIMER39mm
Power Reserve
Stratoliner S-4160h
Prospex SPEEDTIMER40h
Water Resistance
Stratoliner S-41200m
Prospex SPEEDTIMER100m
MSRP
Stratoliner S-41$5,450
Prospex SPEEDTIMER$725

Full specifications

Case

5 specs
Diameter
41mm
39mm
Thickness
14mm
13.3mm
Lug-to-Lug
45.5mm
Lug Width
21mm
20mm
Water Resistance
200m
100m

Crystal & Dial

4 specs
Crystal Shape
Flat
Curved
AR Coating
Inner
Anti-reflective coating on inner surface
Dial Color
White
Black
Lume
None
LumiBrite on hands and index(es)

Movement

4 specs
Caliber
Manufacture Caliber WERK 17
V192
Type
Automatic
Quartz
Power Reserve
60h
40h
Jewels
36
25

Pricing

1 specs
MSRP
$5,450
$725

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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 Stratoliner S-41

Owners widely praise the Fortis Stratoliner S-41 for its purpose-built design and outstanding details, particularly its space blue lume and bright orange date on the dial. Reviewers note the WERK 17 movement offers a 60-hour power reserve. However, the Fortis Stratoliner S-41's 41mm case thickness and lug-to-lug distance lead some to perceive it as wearing large, and the dial's small text and flat design are flagged as potential drawbacks. Overall, owners and reviewers highlight the Fortis Stratoliner S-41's unique design and innovative movement as its primary strengths.

Seiko Prospex SPEEDTIMER

Owners widely praise the Seiko Prospex SPEEDTIMER's gorgeous, unique red dial and vintage-inspired design, finding it a sturdy and reliable everyday watch. Some owners, however, question the value proposition at around $700 for a solar quartz model, citing its 13-15mm thickness and the 24-hour subdial as drawbacks. Accuracy figures vary, with one owner reporting +1/+2 seconds per day, while another notes the V192 solar movement offers a six-month power reserve. Overall, owners and reviewers find the Seiko Prospex SPEEDTIMER a capable and versatile chronograph, with its striking dial and everyday wearability being the most frequently cited strengths.

From video reviewers

The Seiko Prospex SPEEDTIMER's solar movement provides reliable power without battery replacements and accurate timekeeping, with a claimed accuracy of ±15 seconds per month. A notable trade-off is the watch's slightly thicker profile and somewhat lacking lume brightness. Reviewers disagree on whether the bezel action is smooth and clicky, with one reviewer praising it and the other not mentioning it.

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