Side by side

Zelos Hammerhead (Tantalum LE)vsOak & Oscar The Humboldt GMT

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

Hammerhead (Tantalum LE)
ZelosHammerhead (Tantalum LE)
MSRP $1,499
The Humboldt GMT
Oak & OscarThe Humboldt GMT
MSRP $2,175

At a glance

18 of 29 specs differ
Diameter
Hammerhead (Tantalum LE)44mm
The Humboldt GMT39.5mm
Power Reserve
Hammerhead (Tantalum LE)40h
The Humboldt GMT56 hoursh
Water Resistance
Hammerhead (Tantalum LE)300m
The Humboldt GMT200m
MSRP
Hammerhead (Tantalum LE)$1,499
The Humboldt GMT$2,175

Full specifications

Case

9 specs
Category
Diver
GMT
Diameter
44mm
39.5mm
Thickness
13mm
12.5mm
Lug-to-Lug
44mm
46.8mm
Lug Width
22mm
20mm
Material
Titanium
316L Stainless Steel
Finish
Brushed and polished
Brushed
Water Resistance
300m
200m
Caseback
Solid
Solid screw-down

Crystal & Dial

5 specs
Crystal
Domed Sapphire
Sapphire
Crystal Shape
Flat
Double-domed
AR Coating
Inner
Underside
Dial Color
Tantalum LE
White
Lume
None
Super-LumiNova

Movement

3 specs
Caliber
Seiko NH35
Sellita SW330
Beat Rate
28,800 vph
4 vph
Power Reserve
40h
56 hoursh

Pricing

1 specs
MSRP
$1,499
$2,175

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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.

Zelos Hammerhead (Tantalum LE)

The Zelos Hammerhead (Tantalum LE) features a forged carbon dial and bezel insert with infused lume. On balance, owners and reviewers rate the Zelos Hammerhead (Tantalum LE) highly for its unique material composition and substantial feel.

Oak & Oscar The Humboldt GMT

Oak & Oscar The Humboldt GMT owners widely praise its exceptional accuracy, often running at or near 0 seconds per day, and its comfortable wearability with subtle design details. The construction quality for the price point, sandwich lume, and anti-magnetic properties are also highlighted. Some owners find the bracelet sizing adjustment slightly awkward, and one noted the lume could be brighter. Overall, owners rate the Oak & Oscar The Humboldt GMT highly for its accuracy and comfortable wearability.

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