Side by side

Serica Ref. 5303 Diving ChronometervsIWC Schaffhausen Iw328801 Aquatimer Automatic

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
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.

IWC Schaffhausen Iw328801 Aquatimer Automatic

Owners widely praise the IWC Schaffhausen Iw328801 Aquatimer Automatic as a beautiful, solid, and hard-wearing watch with great lume and a functional bezel. Some owners find it chunky and note that the non-removable bars limit strap options, while one reviewer suggests its utilitarian and angular look, combined with a non-tapering bracelet and substantial weight, indicates a need for evolutionary refinement. The 42mm case feels robust and over-engineered, featuring a unique SafeDive bezel system. The IWC 32111 automatic movement offers a 120-hour power reserve. On balance, owners and reviewers rate the IWC Schaffhausen Iw328801 Aquatimer Automatic well for its robust build and unique bezel system, despite some finding it chunky.

At a glance

17 of 29 specs differ
Diameter
Ref. 5303 Diving Chronometer39mm
Iw328801 Aquatimer Automatic42mm
Power Reserve
Ref. 5303 Diving Chronometer42h
Iw328801 Aquatimer Automatic120h
Water Resistance
Ref. 5303 Diving Chronometer300m
Iw328801 Aquatimer Automatic300m
MSRP
Ref. 5303 Diving Chronometer$1,768
Iw328801 Aquatimer Automatic$6,700

Full specifications

Case

6 specs
Diameter
39mm
42mm
Thickness
12.2mm
14.1mm
Lug-to-Lug
46.5mm
Lug Width
20mm
22mm
Finish
Brushed and polished
Steel
Caseback
Solid

Crystal & Dial

6 specs
Crystal
Sapphire
Crystal Shape
Flat
AR Coating
Yes
Dial Color
Enamel Black
Blue
Indices
Applied
Lume
Super-LumiNova
None

Movement

4 specs
Caliber
M100 COSC
32111
Power Reserve
42h
120h
Jewels
25
21
Complications
COSC
None

Pricing

1 specs
MSRP
$1,768
$6,700
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