Side by side

Serica Ref. 5303 Diving ChronometervsBreitling Top Time B01 Racing

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
Top Time B01 Racing
BreitlingTop Time B01 Racing
MSRP $750
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.

Breitling Top Time B01 Racing

The Breitling Top Time B01 Racing is lauded for its compact 38mm cushion case, which enhances wearability and evokes 1960s designs, and its dashboard-inspired dials. Owners appreciate the in-house B01 automatic movement and the 100m water resistance. Some reviewers note the case features abundant polishing, with a minority desiring more brushed finishing. The perforated leather straps are designed to match the dial colors. Owners are split on the lug-to-lug length, with recommendations for in-person try-ons due to wrist shape variations. Overall, owners rate the Breitling Top Time B01 Racing highly for its compact, wearable design and the quality of its in-house movement.

At a glance

18 of 29 specs differ
Diameter
Ref. 5303 Diving Chronometer39mm
Top Time B01 Racing38mm
Power Reserve
Ref. 5303 Diving Chronometer42h
Top Time B01 Racing70h
Water Resistance
Ref. 5303 Diving Chronometer300m
Top Time B01 Racing100m
MSRP
Ref. 5303 Diving Chronometer$1,768
Top Time B01 Racing$750

Full specifications

Case

7 specs
Category
Diver
Mechanical
Diameter
39mm
38mm
Thickness
12.2mm
13.07mm
Lug-to-Lug
46.5mm
Finish
Brushed and polished
Stainless steel
Water Resistance
300m
100m
Caseback
Solid

Crystal & Dial

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

Movement

5 specs
Caliber
M100 COSC
Breitling B01
Beat Rate
28,800 vph
0 vph
Power Reserve
42h
70h
Jewels
25
34
Complications
COSC
None

Pricing

1 specs
MSRP
$1,768
$750
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