Aigi Watches NORTHERN LIGHTS AUTOMATICvsSeiko 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.

NORTHERN LIGHTS AUTOMATIC

Prospex Sea 1968 Heritage Diver's GMT
Diameter
43mm
42mm
Lug-to-Lug
49mm
48.6mm
lowest
Thickness
11mm
lowest
12.9mm
Water Resistance
200m
200m
Power Reserve
n/a
72h
MSRP
$443
lowest
$1,500
Movement
Seiko NH35
Seiko 6R54
Case
4 specsCrystal & Dial
3 specsMovement
3 specsPricing
1 specsReviews
Synthesized for each watch independently from owner discussions, enthusiast forums, written reviews, and video reviewers.
Owners praise the Northern Lights dial for its character in sunlight, comparing it favorably to Grand Seiko's dials. Some owners question the brand's longevity and suggest more reputable alternatives for a safer purchase. Concerns are raised about the watch's chunkiness, with a 43mm diameter and 49mm lug-to-lug. One owner noted the watch arrived with a Miyota 9015 movement, not the expected Seiko NH35. Overall, owners find the Aigi Watches NORTHERN LIGHTS AUTOMATIC to be a decent value at $199, with the dial being a standout feature.
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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