Side by side

Serica Ref. 5303 Diving ChronometervsLorier Astra Cosmic Blue

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
Astra Cosmic Blue
LorierAstra Cosmic Blue
MSRP $499

At a glance

13 of 29 specs differ
Diameter
Ref. 5303 Diving Chronometer39mm
Astra Cosmic Blue36mm
Power Reserve
Ref. 5303 Diving Chronometer42h
Astra Cosmic Blue40h
Water Resistance
Ref. 5303 Diving Chronometer300m
Astra Cosmic Blue50m
MSRP
Ref. 5303 Diving Chronometer$1,768
Astra Cosmic Blue$499

Full specifications

Case

6 specs
Category
Diver
Field
Diameter
39mm
36mm
Thickness
12.2mm
Lug-to-Lug
46.5mm
Lug Width
20mm
18mm
Water Resistance
300m
50m

Crystal & Dial

3 specs
AR Coating
Yes
Inner
Dial Color
Enamel Black
Blue
Lume
Super-LumiNova
None

Movement

3 specs
Caliber
M100 COSC
Power Reserve
42h
40h
Complications
COSC
None

Pricing

1 specs
MSRP
$1,768
$499

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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.

Lorier Astra Cosmic Blue

Owners widely praise the Lorier Astra Cosmic Blue for its beautiful, vintage 1960s aesthetic and comfortable 36mm size, fitting well even after initial adjustment. Some community members appreciate its clean lines and attractive design, though a few wish for more variation in the brand's case and bracelet designs across its models. Overall, owners rate the Lorier Astra Cosmic Blue highly for its stunning, dressy vintage appeal and wearability.

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