Side by side

Oak & Oscar The Humboldt ExP-02vsLongines ULTRA‑CHRON CARBON

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

The Humboldt ExP-02
Oak & OscarThe Humboldt ExP-02
MSRP $2,400
ULTRA‑CHRON CARBON
LonginesULTRA‑CHRON CARBON
MSRP $5,550

At a glance

22 of 29 specs differ
Diameter
The Humboldt ExP-0239.5mm
ULTRA‑CHRON CARBON43mm
Power Reserve
The Humboldt ExP-0256h
ULTRA‑CHRON CARBON52h
Water Resistance
The Humboldt ExP-02200m
ULTRA‑CHRON CARBON300m
MSRP
The Humboldt ExP-02$2,400
ULTRA‑CHRON CARBON$5,550

Full specifications

Case

9 specs
Category
Tool
Diver
Diameter
39.5mm
43mm
Thickness
12.4mm
14mm
Lug-to-Lug
46.8mm
48.9mm
Lug Width
20mm
22mm
Material
316L Stainless Steel
Titanium
Finish
Brushed and polished
Water Resistance
200m
300m
Caseback
Display
Screw-down case back

Crystal & Dial

5 specs
Crystal Shape
Double-domed
AR Coating
Inner
Both sides
Dial Color
Grey
Silver
Indices
Applied
Applied indexes
Lume
Super-LumiNova BGW9
Super-LumiNova

Movement

7 specs
Caliber
Sellita SW300
L836.6
Beat Rate
28,800 vph
36,000 vph
Power Reserve
56h
52h
Jewels
25
0
Hacking
Yes
No
Hand-winding
Yes
No
Complications
GMT, Chronograph
Hours, minutes, seconds

Pricing

1 specs
MSRP
$2,400
$5,550

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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.

Oak & Oscar The Humboldt ExP-02

Oak & Oscar The Humboldt ExP-02 is a 39.5mm stainless steel tool watch featuring a unique, layered aluminum "ghost dial" for legibility and 200m water resistance, powered by a Sellita SW300 movement. Its appeal is limited by a US$2,550 price and an extremely limited production of 20 pieces, with its experimental dial construction done in Chicago. Overall, reviewers highlight the endearing dial and in-house bezel production as key features of the Oak & Oscar Humboldt ExP-02.

Longines ULTRA‑CHRON CARBON

The Longines ULTRA‑CHRON CARBON is praised for its lightweight composite case and unique "Batman" aesthetic, with its 5Hz movement widely noted for exceptional accuracy. Owners widely report the high-beat movement is the cheapest 5Hz option available. Some owners find the non-rotating bezel a relief, while others consider it a deal-breaker, noting the watch is no longer a dive watch. On balance, owners and reviewers highly rate the Longines ULTRA‑CHRON CARBON for its cool, lightweight design and the exceptional accuracy of its 5Hz movement.

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