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.

Decima Gatekeeper at true scale

Gatekeeper

Seiko Baby Alpinist at true scale

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 specs
Thickness
9.9mm
12.9mm
Lug Width
46mm
20mm
Water Resistance
50m
200m

Crystal & Dial

4 specs
Crystal Shape
n/a
Curved
AR Coating
Yes
Anti-reflective coating on inner surface
Dial Color
White
n/a
Lume
None
LumiBrite on hands and index(es)

Movement

3 specs
Caliber
Miyota 9039
Seiko 6R35
Power Reserve
42h
70h
Jewels
0
24

Pricing

1 specs
MSRP
$599
$725
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Reviews

Synthesized for each watch independently from owner discussions, enthusiast forums, written reviews, and video reviewers.

Decima Gatekeeper

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.

Seiko Baby Alpinist

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.

From video reviewers

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.