Aigi Watches NORTHERN LIGHTS AUTOMATICvsSeiko 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.

NORTHERN LIGHTS AUTOMATIC

Prospex Sea
Diameter
43mm
43.8mm
Lug-to-Lug
49mm
48.7mm
lowest
Thickness
11mm
lowest
12.8mm
Water Resistance
200m
200m
Power Reserve
n/a
41h
MSRP
$443
lowest
$625
Movement
Seiko NH35
Seiko 4R35
Case
3 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 is widely praised for its excellent value as a sport watch, with owners highlighting its comfortable wearability and generous lume. Reviewers note its solid build quality and attractive design, with some specifically mentioning the matte black dial as a strong point. One owner reports accuracy around +1 to +2 seconds per day. The 43.8mm case size is considered substantial by some, and one owner found the watch heavy and thick, regretting not choosing a different variant. Overall, owners and reviewers rate the Seiko Prospex Sea highly for its blend of classic design and modern utility at an accessible price point.
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