Bamford of London Carbon B347vsSeiko 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.

Carbon B347

Prospex SPEEDTIMER Mechanical
Diameter
41.5mm
39.5mm
Lug-to-Lug
n/a
44.5mm
Thickness
14.5mm
12mm
lowest
Water Resistance
100m
200m
highest
Power Reserve
62h
72h
highest
MSRP
$2,847
$995
lowest
Movement
Sellita SW510
Seiko 6R55
Case
6 specsCrystal & Dial
4 specsMovement
3 specsPricing
1 specsReviews
Synthesized for each watch independently from owner discussions, enthusiast forums, written reviews, and video reviewers.
Owners and reviewers widely praise the Bamford of London Carbon B347 for its striking forged carbon case, which is noted for its unique surface texture and visual appeal, especially in sunlight. The watch is commended for its retro-style chronograph aesthetics, well-balanced dial, and the use of a dependable Sellita SW510 automatic movement. The 41.5mm case size, 14.5mm thickness, and 100m water resistance are considered reasonable for a chronograph, and the monopusher complication is highlighted as a technically uncommon and attractive feature. One owner notes the finishing is spectacular, with the forged carbon case looking even better in person. Source 6 discusses a different model, the Bamford London GMT Forged Carbon, noting its comfortable wear and legible design, but also a minor critique of slightly oversized markers on its GMT bezel.
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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