Side by side

Fortis Flieger F-43 BicompaxvsSeiko Prospex SPEEDTIMER

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

Flieger F-43 Bicompax
FortisFlieger F-43 Bicompax
MSRP $4,180
Prospex SPEEDTIMER
SeikoProspex SPEEDTIMER
MSRP $2,200

At a glance

14 of 29 specs differ
Diameter
Flieger F-43 Bicompax43mm
Prospex SPEEDTIMER42mm
Power Reserve
Flieger F-43 Bicompax58h
Prospex SPEEDTIMER40h
Water Resistance
Flieger F-43 Bicompax200m
Prospex SPEEDTIMER100m
MSRP
Flieger F-43 Bicompax$4,180
Prospex SPEEDTIMER$2,200

Full specifications

Case

5 specs
Diameter
43mm
42mm
Thickness
14.5mm
12.9mm
Lug-to-Lug
49.6mm
Lug Width
22mm
20mm
Water Resistance
200m
100m

Crystal & Dial

4 specs
Crystal Shape
Flat
Curved
AR Coating
Inner
Super-clear coating
Dial Color
Original
Black
Lume
None
LumiBrite on hands and index(es)

Movement

4 specs
Caliber
Sellita SW510 BH a
5X83
Type
Automatic
Quartz
Power Reserve
58h
40h
Jewels
27
14

Pricing

1 specs
MSRP
$4,180
$2,200

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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-43 Bicompax

Owners widely praise the Fortis Original for its tool-watch aesthetic, legibility, and robust construction, with many noting excellent lume that lasts all night and precise day/date changes at midnight. The brushed stainless steel case is well-finished, and the 38mm size is considered comfortable and well-weighted despite being smaller than modern watches. Accuracy figures range from +2 seconds/day to +8 seconds/day, and some owners compare Fortis quality favorably to Omega. However, some users find the MSRP too high compared to brands like Sinn and Damasko, and one owner reported internal parts dislodging from a limited edition model. Concerns have also been raised about stripped lug screws on B-42 models and potential parts shortages due to past bankruptcy protection filings. Overall, owners rate the Fortis Original highly for its durable construction and tool-watch functionality at a competitive price point.

Seiko Prospex SPEEDTIMER

Owners widely praise the Seiko Prospex SPEEDTIMER for its unique dial colors and vintage-inspired design, with many appreciating its compact 39mm case size and 100m or 200m water resistance. Reviewers and owners note the V192 solar movement’s power reserve indicator and its reliability, though some owners express a preference for automatic movements. One owner finds the $700 price for a solar quartz model expensive, while another criticizes the €860 price point and desires a thinner case and a bracelet with quick-release or micro-adjustment. On balance, owners and reviewers appreciate the Seiko Prospex SPEEDTIMER for its distinctive aesthetic and versatile wearability, despite some reservations about its price and case thickness.

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