Side by side

Borealis Watch Co. Estoril 300 GMTvsIslander Islander Hudson "Harpoon Diver" 40mm Watch with Degrading Black Dial #ISL-302

The numbers, the dial colors, the calibers — laid out so you can stop flipping between tabs.

Estoril 300 GMT
Borealis Watch Co.Estoril 300 GMT
MSRP $600
Islander Hudson "Harpoon Diver" 40mm Watch with Degrading Black Dial #ISL-302
IslanderIslander Hudson "Harpoon Diver" 40mm Watch with Degrading Black Dial #ISL-302
MSRP $649

At a glance

17 of 29 specs differ
Diameter
Estoril 300 GMT41.50mm
Islander Hudson "Harpoon Diver" 40mm Watch with Degrading Black Dial #ISL-30240mm
Power Reserve
Estoril 300 GMT40h
Islander Hudson "Harpoon Diver" 40mm Watch with Degrading Black Dial #ISL-302
Water Resistance
Estoril 300 GMT300m
Islander Hudson "Harpoon Diver" 40mm Watch with Degrading Black Dial #ISL-302200m
MSRP
Estoril 300 GMT$600
Islander Hudson "Harpoon Diver" 40mm Watch with Degrading Black Dial #ISL-302$649

Full specifications

Case

7 specs
Diameter
41.50mm
40mm
Thickness
13.5mm
12.1mm
Lug-to-Lug
47mm
0mm
Lug Width
20mm
20mm
Finish
Brushed and polished
Water Resistance
300m
200m
Caseback
Solid
Screw-down

Crystal & Dial

5 specs
Crystal Shape
Flat
AR Coating
Inner
Underside
Dial Color
Black
Indices
Applied
Lume
BGW9
None

Movement

4 specs
Caliber
Miyota 9075
Miyota 9015
Beat Rate
28,800 vph
0 vph
Power Reserve
40h
0h
Jewels
25
0

Pricing

1 specs
MSRP
$600
$649

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Get a note when Borealis Watch Co. Estoril 300 GMT vs Islander Hudson "Harpoon Diver" 40mm Watch with Degrading Black Dial #ISL-302 gets more votes, a community discussion, or a price drop. No account needed.

What people say

Owners + reviewers, side by side

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, robust build quality, and crisp dial, with reviewers highlighting its exceptionally bright BGW9 lume and dive-ready ceramic bezel. Some owners appreciate the brushed and polished finishes, though one owner noted a desire for a white-painted second hand. The included NATO strap is considered too thick with a loose weave, and the sapphire bezel insert is seen by some as a minor aesthetic departure from its inspirations. Overall, owners rate the Borealis Watch Co. Estoril 300 GMT highly for its impressive build quality and value.

Islander Hudson "Harpoon Diver" 40mm Watch with Degrading Black Dial #ISL-302

Owners widely praise the Islander Hudson "Harpoon Diver" 40mm Watch with Degrading Black Dial #ISL-302 for its eye-catching degrading black dial and strong lume. Some owners note the bracelet's tight links and rough clasp edges as drawbacks, though one owner received a replacement bracelet that improved wearability. Opinions are split on the watch's design, with some finding it overdesigned and reminiscent of older Seiko mods, while others appreciate its originality and find it appealing, particularly at its discounted price. On balance, owners appreciate the Islander Hudson "Harpoon Diver" 40mm Watch with Degrading Black Dial #ISL-302 for its unique dial and value, despite some reservations about the bracelet finishing.

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