Seiko Monster Automatic 200MvsSquale 1521 Classic COSC

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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.

Monster Automatic 200M

1521 Classic COSC
Diameter
42mm
42mm
Lug-to-Lug
n/a
48mm
Thickness
n/a
12.5mm
Water Resistance
200m
500m
highest
Power Reserve
41h
highest
38h
MSRP
n/a
$1,965
Movement
Seiko 4R36
Sellita SW200-1
Case
7 specsCrystal & Dial
2 specsMovement
4 specsPricing
1 specsReviews
Synthesized for each watch independently from owner discussions, enthusiast forums, written reviews, and video reviewers.
Owners widely praise the Seiko Monster Automatic 200M for its excellent Lumibrite, reliable performance, and comfortable wearability, with many considering it a bargain. Reviewers and owners alike highlight the watch's robust build and iconic design elements, such as the distinctive bezel grip. Some owners note the rubber strap can be stiff or long, and one owner reported minor time adjustments every few weeks over a decade of daily wear. Overall, owners and reviewers rate the Seiko Monster Automatic 200M highly for its exceptional value and enduring appeal.
Owners widely praise the Squale 1521 Classic COSC's well-proportioned 42mm case, with one reviewer calling it a masterclass in case design. The COSC certification is noted to improve accuracy, and the bezel indices are now fully lumed, a feature some owners find superior. The brushed case with polished chamfers is described as a significant and attractive aesthetic update. However, some owners prefer older bezel designs, and opinions on the lume are mixed, with one user finding it only "okay." One owner reported moisture ingress after a shower due to a loose case back on a new watch. The Squale 1521 Classic COSC is priced at CHF 1,475 and uses a Sellita SW200-1 movement. Overall, owners rate the Squale 1521 Classic COSC highly for its updated finishing and improved accuracy.
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