Seiko Seiko 5 Sports SKX seriesvsUnimatic Modello Uno U1-FM
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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.

Seiko 5 Sports SKX series

Modello Uno U1-FM
Diameter
38mm
40mm
Lug-to-Lug
44.2mm
n/a
Thickness
12.1mm
n/a
Water Resistance
100m
300m
highest
Power Reserve
41h
41h
MSRP
$350
lowest
$820
Movement
Seiko 4R36
Seiko NH35
Case
5 specsCrystal & Dial
3 specsMovement
2 specsPricing
1 specsReviews
Synthesized for each watch independently from owner discussions, enthusiast forums, written reviews, and video reviewers.
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.
The Unimatic Modello Uno U1-FM is lauded for its intensely minimalist, utilitarian design, which reviewers describe as feeling like a technical instrument with clever case details. Owners find the cases very well finished and the price impressive for the quality received, noting its wearability at 13.6mm thick. The matte black dial offers hypnotic light play, and the Seiko NH35A movement is considered simple, reliable, and keeping good time. However, one reviewer points out the Super-LumiNova lume application is slightly uneven between the dial, hands, and bezel pearl. On balance, owners and reviewers rate the Unimatic Modello Uno U1-FM highly for its unique minimalist design and impressive case finishing at its price point.
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