Side by side

Borealis Watch Co. Estoril 300 GMTvsMarathon JDD (Jumbo Day/Date) Anthracite Diver's Automatic

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
JDD (Jumbo Day/Date) Anthracite Diver's Automatic
MarathonJDD (Jumbo Day/Date) Anthracite Diver's Automatic
MSRP $3,250

At a glance

9 of 29 specs differ
Diameter
Estoril 300 GMT41.50mm
JDD (Jumbo Day/Date) Anthracite Diver's Automatic46mm
Power Reserve
Estoril 300 GMT40h
JDD (Jumbo Day/Date) Anthracite Diver's Automatic40h
Water Resistance
Estoril 300 GMT300m
JDD (Jumbo Day/Date) Anthracite Diver's Automatic300m
MSRP
Estoril 300 GMT$600
JDD (Jumbo Day/Date) Anthracite Diver's Automatic$3,250

Full specifications

Case

5 specs
Diameter
41.50mm
46mm
Thickness
13.5mm
18mm
Lug-to-Lug
47mm
55mm
Lug Width
20mm
22mm
Material
Stainless Steel
316L Stainless Steel (Anthracite IP)

Crystal & Dial

2 specs
Dial Color
Black
Anthracite
Lume
BGW9
None

Movement

1 specs
Caliber
Miyota 9075
Sellita SW220-1

Pricing

1 specs
MSRP
$600
$3,250

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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.

Marathon JDD (Jumbo Day/Date) Anthracite Diver's Automatic

Owners widely praise the Marathon JDD (Jumbo Day/Date) Anthracite Diver's Automatic as a tough, underrated tool watch with lifestyle appeal, highlighting its robust build and tritium lume for excellent legibility. However, its 46mm size is a common criticism, with some finding it heavy and top-heavy, and the OEM rubber strap stiff. One owner noted the watch runs about 10 seconds fast after three days, and the ETA 2836-2 movement offers approximately two days of power reserve. On balance, owners and reviewers rate the Marathon JDD (Jumbo Day/Date) Anthracite Diver's Automatic highly for its robust tool-watch build and legibility, despite its substantial size.

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