Beaufort BicompaxvsSeiko Prospex SPEEDTIMER Mechanical
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Measurements
Catalog photos are all shot at the same flattering size. These aren't: every case below shares one millimeter scale.

Bicompax

Prospex SPEEDTIMER Mechanical
Diameter
40.5mm
39.5mm
Lug-to-Lug
47mm
44.5mm
lowest
Thickness
13.8mm
12mm
lowest
Water Resistance
50m
200m
highest
Power Reserve
63h
72h
highest
MSRP
$810
lowest
$995
Movement
Sellita SW510
Seiko 6R55
Case
4 specsCrystal & Dial
4 specsMovement
4 specsPricing
1 specsReviews
Synthesized for each watch independently from owner discussions, enthusiast forums, written reviews, and video reviewers.
Owners widely praise the Beaufort Bicompax for its attractive bicompax chronograph design, clean aesthetic, and excellent legibility with effective lume. The Sellita SW510 BH b movement is noted for performing well, with winding and setting actions comparable to ETA movements and accuracy within COSC parameters at +5 seconds/day. Fit and finish are considered spot on, with a well-executed gradient dial and subdials, and the h-link bracelet is described as comfortable and easy to size. Some owners find the price a bit high for the specifications on paper, and one commenter felt the blue dial could have more depth. On balance, owners and reviewers rate the Beaufort Bicompax highly for its vintage aesthetic and reliable manual-wind chronograph movement at 40.5mm.
The Seiko Prospex SPEEDTIMER Mechanical is widely praised for its comfortable 39.5mm case size and appealing matte silver-white dial with LumiBrite indices. Owners find the watch visually attractive and comfortable for daily wear, with the 72-hour power reserve of the 6R55 automatic movement noted as a strength. Some users appreciate the chronograph function for everyday tasks, while others acknowledge it is rarely used by most purchasers. The watch features a countdown bezel and 20 bar water resistance. On balance, owners and reviewers rate the Seiko Prospex SPEEDTIMER Mechanical highly for its wearability and practical power reserve.
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