Seiko Seiko 5 Sports SKX seriesvsUnimatic Modello Uno U1-NU
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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-NU
Diameter
38mm
40mm
Lug-to-Lug
44.2mm
n/a
Thickness
12.1mm
n/a
Water Resistance
100m
300m
highest
Power Reserve
41h
n/a
MSRP
$350
lowest
$910
Movement
Seiko 4R36
Seiko NH35
Case
5 specsCrystal & Dial
3 specsMovement
3 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-NU is widely appreciated for its intensely minimalist, utilitarian design that feels like a technical instrument, with clever case details and a matte black dial offering hypnotic light play. Owners and reviewers consistently praise its unique style and solid build quality at its price point, noting impressive case finishing and a remarkably low price for the perceived quality. The Seiko NH35 automatic movement is considered reliable and keeps good time. However, the lume application is slightly uneven between the dial, hands, and bezel pearl, and some find the clasp sharp. The 24-hour rotating bezel's hourly clicks are noted as a missed opportunity for a more purposeful GMT complication. Overall, owners rate the Unimatic Modello Uno U1-NU highly for its distinctive minimalist aesthetic and strong build quality for the price.
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