Alsta NautoscaphvsSeiko Seiko 5 Sports SKX series
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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.

Nautoscaph

Seiko 5 Sports SKX series
Diameter
40mm
38mm
Lug-to-Lug
51.3mm
44.2mm
lowest
Thickness
16.2mm
12.1mm
lowest
Water Resistance
300m
highest
100m
Power Reserve
41h
41h
MSRP
$695
$350
lowest
Movement
Seiko NH35
Seiko 4R36
Case
6 specsCrystal & Dial
3 specsMovement
2 specsPricing
1 specsReviews
Synthesized for each watch independently from owner discussions, enthusiast forums, written reviews, and video reviewers.
Owners widely praise the Alsta Nautoscaph for its vintage-inspired design, cinematic appearances in films like "Jaws" and "Fear and Loathing in Las Vegas," and its "70s cool" aesthetic. Reviewers note its contrasting case finishes and functional, lumed dial, though the absence of a lumed numeral at 3 o'clock due to the date window is a minor drawback. One reviewer flags the watch's 15.1mm thickness and poor bracelet execution as significant issues, deeming it a "colossal failure" at its price point, while another owner suggests it is egregiously overpriced at MSRP but a fun summer piece in the $500-600 range. On balance, owners and reviewers are divided on the Alsta Nautoscaph's value and wearability, with its aesthetic appeal and cinematic provenance being its strongest selling points.
The Seiko 5 Sports SKX series is widely praised as an excellent value gateway watch, with owners and reviewers highlighting its solid build and powerful lume. The 22mm bracelet is noted for its comfort, and the watch offers numerous style options. Some owners find the original SKX models heavy and bulky, while others appreciate their ruggedness and iconic dive watch design. The Seiko 5 Sports SKX series offers an upgraded movement with hacking and hand-winding, and standard spring bars for easier strap changes. However, it lacks the screw-down crown and ISO certification of the original SKX, leading some to consider it less of a tool watch. On balance, owners and reviewers rate the Seiko 5 Sports SKX series highly for its value and modern features, despite some preferring the tool watch capabilities of its predecessor.
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