Sheffield 1A 40mmvsSeiko 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.

1A 40mm

Seiko 5 Sports SKX series
Diameter
40mm
38mm
Lug-to-Lug
48mm
44.2mm
lowest
Thickness
13mm
12.1mm
lowest
Water Resistance
200m
highest
100m
Power Reserve
n/a
41h
MSRP
$228
lowest
$350
Movement
Seiko NH35
Seiko 4R36
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 widely praise the Sheffield 1A 40mm for its superb quality, sturdiness, and amazing price, with particular appreciation for its blue dial and strong lume. The watch features a 40mm steel case and a sapphire crystal. One owner notes the bezel action could be crisper. On balance, owners rate the Sheffield 1A 40mm highly for its exceptional value and build quality at the price point.
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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