March LA.B Bonzer Automatique MarsvsSeiko Prospex Sea
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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.

Bonzer Automatique Mars

Prospex Sea
Diameter
41mm
41.3mm
Lug-to-Lug
n/a
48.2mm
Thickness
n/a
12.5mm
Water Resistance
100m
300m
highest
Power Reserve
n/a
72h
MSRP
$1,605
$1,100
lowest
Movement
La Joux-Perret G100
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.
March LA.B Bonzer Automatique Mars owners widely praise its handsome and unique designer aesthetic, noting its comfortable wearability. Some reviewers find the decorative dial sacrifices legibility, and one owner reports the silicone strap attracts dust. The watch is powered by a La Joux-Perret G100 automatic movement with a 68-hour power reserve and has 100m water resistance. On balance, owners and reviewers rate the March LA.B Bonzer Automatique Mars highly for its distinctive design and comfortable wear.
Owners and reviewers widely praise the Seiko Prospex Sea for its robust build quality and fair price, with many noting its comfortable silicone strap. Some owners find the watch's size, thickness, and weight to be uncomfortable for smaller wrists, while others consider the size perfect. The consensus is that the Seiko Prospex Sea offers excellent value and build quality for its price.
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