Side by side

Serica Ref. 5303 Diving ChronometervsOak & Oscar The Humboldt 12-hr

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

Ref. 5303 Diving Chronometer
SericaRef. 5303 Diving Chronometer
MSRP $1,768
The Humboldt 12-hr
Oak & OscarThe Humboldt 12-hr
MSRP $1,750

At a glance

16 of 29 specs differ
Diameter
Ref. 5303 Diving Chronometer39mm
The Humboldt 12-hr39.5mm
Power Reserve
Ref. 5303 Diving Chronometer42h
The Humboldt 12-hr42 hoursh
Water Resistance
Ref. 5303 Diving Chronometer300m
The Humboldt 12-hr200m
MSRP
Ref. 5303 Diving Chronometer$1,768
The Humboldt 12-hr$1,750

Full specifications

Case

7 specs
Category
Diver
Tool
Diameter
39mm
39.5mm
Thickness
12.2mm
12.4mm
Lug-to-Lug
46.5mm
46.8mm
Material
Stainless Steel
316L Stainless Steel
Water Resistance
300m
200m
Caseback
Solid
Solid screw-down

Crystal & Dial

3 specs
Crystal Shape
Flat
Double-domed
AR Coating
Yes
Underside
Dial Color
Enamel Black
Grey

Movement

5 specs
Caliber
M100 COSC
ETA 2892A2
Beat Rate
28,800 vph
4 vph
Power Reserve
42h
42 hoursh
Jewels
25
21
Complications
COSC
GMT, Chronograph, Date

Pricing

1 specs
MSRP
$1,768
$1,750

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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.

Serica Ref. 5303 Diving Chronometer

Owners widely praise the Serica Ref. 5303 Diving Chronometer for its excellent wearability, definitive style, and smooth, confident bezel action. The dual scale on the bezel is noted as surprisingly useful, and the crown action, winding, and hacking are reported to work perfectly. One owner describes the Serica 5303-3 as gorgeous and unique, though another notes the crown can appear comically large. On balance, owners rate the Serica Ref. 5303 Diving Chronometer highly for its blend of unique design and robust functionality.

Oak & Oscar The Humboldt 12-hr

Oak & Oscar The Humboldt 12-hr owners widely praise its comfortable, solid bracelet with screw links and tight end-link fit, along with its awesome sandwich dial featuring superb grain and crisp details. The 12-hour bezel is noted as excellent for tracking a second time zone, and the orange second hand adds a nice pop. One owner reports the watch has outstanding quality and a perfect fit on smaller wrists, while another notes its legibility and great presence on various straps. A reviewer describes it as a 40mm stainless steel tool watch with a matte, brushed finish and a sandwich dial, powered by an ETA 2892-A2 movement with a 42-hour power reserve. Some in the line report the lume could be brighter. On balance, owners and reviewers rate Oak & Oscar The Humboldt 12-hr highly for its build quality and versatile tool-watch design.

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