March LA.B Belza AutomatiquevsSeiko Prospex Sea 1968 Heritage Diver's GMT

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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.

March LA.B Belza Automatique at true scale

Belza Automatique

Seiko Prospex Sea 1968 Heritage Diver's GMT at true scale

Prospex Sea 1968 Heritage Diver's GMT

Diameter

40mm

42mm

Lug-to-Lug

n/a

48.6mm

Thickness

n/a

12.9mm

Water Resistance

200m

200m

Power Reserve

n/a

72h

MSRP

$1,743

$1,500

lowest

Movement

La Joux-Perret G100

Seiko 6R54

Case

5 specs
Diameter
40mm
42mm
Thickness
n/a
12.9mm
Lug-to-Lug
n/a
48.6mm
Lug Width
n/a
20mm
Material
n/a
Stainless Steel

Crystal & Dial

4 specs
Crystal
n/a
Sapphire
AR Coating
n/a
Anti-reflective coating on inner surface
Dial Color
Blue
n/a
Lume
None
LumiBrite on hands, index(es) and bezel

Movement

3 specs
Caliber
La Joux-Perret G100
Seiko 6R54
Power Reserve
0h
72h
Jewels
0
24

Pricing

1 specs
MSRP
$1,743
$1,500
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Reviews

Synthesized for each watch independently from owner discussions, enthusiast forums, written reviews, and video reviewers.

March LA.B Belza Automatique

Owners recommend the March LA.B Belza Automatique for its design-forward, daring, and unusual timepiece aesthetic. The La Joux-Perret G100 automatic movement is noted as well-decorated. On balance, owners and reviewers rate the March LA.B Belza Automatique highly for its distinctive, '70s-inspired design.

Seiko Prospex Sea 1968 Heritage Diver's GMT

The Seiko Prospex Sea 1968 Heritage Diver's GMT is widely praised for its build quality, finishing, and value, with owners noting its comfortable wearability and attractive aesthetic, particularly the silver/white sunray dial and blue ceramic bezel. The improved bracelet clasp with excellent micro-adjustment is a recurring positive point. Some owners report accuracy figures of +3 seconds per day or +/- 5 seconds per day, exceeding the movement's stated range. However, the GMT functionality is considered secondary to its dive watch capabilities by some, with the GMT scale being difficult to read and the caller-style GMT movement being a drawback for certain users. The dial contrast is also noted as lacking by some, and the crown at 4 o'clock is undesirable for a few. On balance, owners and reviewers rate the Seiko Prospex Sea 1968 Heritage Diver's GMT highly for its blend of dive watch character and GMT functionality, offering significant features for its price.

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