Side by side

Serica Ref. 5303 Diving ChronometervsSinn 556 I WT

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

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.

Sinn 556 I WT

The Sinn 556 I WT is seen as a good value, though some owners find its stark black dial and white markers visually flat compared to more textured dials. While its minimalist design, screw-down crown, and water resistance are praised, some find the two-dimensional dial lacks visual substance. Overall, owners rate the Sinn 556 I WT well for its value and solid specifications, despite some finding its austere dial design polarizing.

At a glance

19 of 29 specs differ
Diameter
Ref. 5303 Diving Chronometer39mm
556 I WT38.5mm
Power Reserve
Ref. 5303 Diving Chronometer42h
556 I WT38h
Water Resistance
Ref. 5303 Diving Chronometer300m
556 I WT200m
MSRP
Ref. 5303 Diving Chronometer$1,768
556 I WT$2,106

Full specifications

Case

8 specs
Category
Diver
Tool
Diameter
39mm
38.5mm
Thickness
12.2mm
11mm
Lug-to-Lug
46.5mm
Lug Width
0mm
20mm
Finish
satinized
Water Resistance
300m
200m
Caseback

Crystal & Dial

5 specs
Crystal Shape
AR Coating
Yes
Underside
Dial Color
Enamel Black
Red
Indices
Applied
Lume
Super-LumiNova
Luminescent

Movement

5 specs
Caliber
M100 COSC
Sellita SW200-1
Beat Rate
0 vph
28,800 vph
Power Reserve
42h
38h
Jewels
0
26
Complications
COSC
None

Pricing

1 specs
MSRP
$1,768
$2,106
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