Side by side
Borealis Watch Co. Estoril 300 GMTvsOak & Oscar The Humboldt GMT Titanium
The numbers, the dial colors, the calibers — laid out so you can stop flipping between tabs.
At a glance
16 of 29 specs differDiameter
Estoril 300 GMT41.50mm
The Humboldt GMT Titanium39.5mm
Power Reserve
Estoril 300 GMT40h
The Humboldt GMT Titanium56 hoursh
Water Resistance
Estoril 300 GMT300m
The Humboldt GMT Titanium200m
MSRP
Estoril 300 GMT$600
The Humboldt GMT Titanium$2,950
Full specifications
Case
8 specsCategory
Diver
GMT
Diameter
41.50mm
39.5mm
Thickness
13.5mm
12.5mm
Lug-to-Lug
47mm
46.8mm
Lug Width
20mm
20mm
Material
Stainless Steel
Grade 5 Titanium
Water Resistance
300m
200m
Caseback
Solid
Solid screw-down
Crystal & Dial
4 specsCrystal Shape
Flat
Double-domed
AR Coating
Inner
Underside
Dial Color
Black
Green
Lume
BGW9
Super-LumiNova
Movement
3 specsCaliber
Miyota 9075
Sellita SW330
Beat Rate
28,800 vph
4 vph
Power Reserve
40h
56 hoursh
Pricing
1 specsMSRP
$600
$2,950
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