Signum CerovsSeiko 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.

Signum Cero at true scale

Cero

Seiko Baby Alpinist at true scale

Baby Alpinist

Diameter

39.5mm

38mm

Lug-to-Lug

n/a

46mm

Thickness

13.4mm

12.9mm

lowest

Water Resistance

200m

200m

Power Reserve

n/a

70h

MSRP

$519

lowest

$725

Movement

Seiko NH35

Seiko 6R35

Case

5 specs
Diameter
39.5mm
38mm
Thickness
13.4mm
12.9mm
Lug-to-Lug
n/a
46mm
Lug Width
n/a
20mm
Material
Bronze
Stainless Steel

Crystal & Dial

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

Movement

3 specs
Caliber
Seiko NH35
Seiko 6R35
Power Reserve
n/a
70h
Jewels
0
24

Pricing

1 specs
MSRP
$519
$725
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Reviews

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

Signum Cero

Owners widely praise the Signum Cero's exceptional lume, satisfying bezel action, and distinctive dial designs, with the forged carbon and turquoise variants specifically highlighted for their visual appeal. The Seiko NH35 movement is noted as a reliable engine. Some owners find the 39.5mm case wears smaller, and one user reported the crown requires extra pressure to screw down. Overall, owners rate the Signum Cero highly for its unique aesthetics and strong lume at its price point.

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.