Borealis Watch Co. Estoril 300 GMTvsSquale 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.

Borealis Watch Co. Estoril 300 GMT at true scale

Estoril 300 GMT

Squale 1521 Classic COSC at true scale

1521 Classic COSC

Diameter

41.5mm

42mm

Lug-to-Lug

47mm

lowest

48mm

Thickness

13.5mm

12.5mm

lowest

Water Resistance

300m

500m

highest

Power Reserve

n/a

38h

MSRP

$600

lowest

$1,965

Movement

Miyota 9075

Sellita SW200-1

Case

5 specs
Diameter
41.5mm
42mm
Thickness
13.5mm
12.5mm
Lug-to-Lug
47mm
48mm
Material
Stainless Steel
Steel
Water Resistance
300m
500m

Crystal & Dial

4 specs
Crystal Shape
n/a
Flat
Dial Color
n/a
Black
Indices
n/a
Applied
Lume
BGW9
None

Movement

2 specs
Caliber
Miyota 9075
Sellita SW200-1
Power Reserve
0h
38h

Pricing

1 specs
MSRP
$600
$1,965
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Reviews

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

Borealis Watch Co. Estoril 300 GMT

Owners widely praise the Borealis Watch Co. Estoril 300 GMT for its excellent value and robust build quality, featuring crisp dial details and exceptionally bright BGW9 lume. Some owners note the bezel insert's sapphire construction as an aesthetic departure from its inspiration, and one owner wishes for a white-painted second hand. The Borealis Watch Co. Estoril 300 GMT is described as dive-ready with a ceramic bezel and homage design. Overall, owners rate the Borealis Watch Co. Estoril 300 GMT highly for its impressive build quality and value at the price point.

Squale 1521 Classic COSC

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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