Decima GatekeepervsSeiko Baby Alpinist
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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.

Gatekeeper

Baby Alpinist
Diameter
38mm
38mm
Lug-to-Lug
46mm
46mm
Thickness
9.9mm
lowest
12.9mm
Water Resistance
50m
200m
highest
Power Reserve
42h
70h
highest
MSRP
$599
lowest
$725
Movement
Miyota 9039
Seiko 6R35
Case
3 specsCrystal & Dial
4 specsMovement
3 specsPricing
1 specsReviews
Synthesized for each watch independently from owner discussions, enthusiast forums, written reviews, and video reviewers.
The Decima Gatekeeper is praised for its hypnotizing dial, with design elements that draw comparisons to the Ingenieur and Czapek. Owners note the watch features a Miyota 9039 automatic movement, a 38mm case, and 50m water resistance. On balance, owners rate the Decima Gatekeeper highly for its striking dial design.
Owners widely praise the Seiko Baby Alpinist for its attractive design, legible dial, and comfortable 38mm cushion case that wears smaller than its dimensions suggest. Reviewers and owners alike highlight the watch's excellent value, particularly when on sale, and appreciate its finishing, including outstanding brushing and a gorgeous reflective dial with applied indices. Some reviewers note the internal rotating bezel action is good for the price, though not as refined as higher-end models, and one owner would prefer a numbered bezel. A drawback mentioned by one owner is the lack of AR coating, and accuracy is reported by one source as approximately -10 seconds per day. The stock strap is frequently described as stiff and uncomfortable, though owners find success with break-in or replacement. Overall, owners and reviewers rate the Seiko Baby Alpinist highly for its comfortable wearability and attractive finishing at a fair price.
The watch's bezel action is smooth and precise. The watch's lume is somewhat lacking, with the hour markers not being as bright as they'd like. Reviewers disagree on the ideal case size, with some preferring 38mm and others 41.4mm.
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