Side by side

Serica Ref. 5303 Diving ChronometervsZelos Aurora Moonphase

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
Aurora Moonphase
ZelosAurora Moonphase
MSRP $949

At a glance

12 of 29 specs differ
Diameter
Ref. 5303 Diving Chronometer39mm
Aurora Moonphase39mm
Power Reserve
Ref. 5303 Diving Chronometer42h
Aurora Moonphase40h
Water Resistance
Ref. 5303 Diving Chronometer300m
Aurora Moonphase200m
MSRP
Ref. 5303 Diving Chronometer$1,768
Aurora Moonphase$949

Full specifications

Case

5 specs
Category
Diver
Moonphase
Thickness
12.2mm
12.5mm
Lug-to-Lug
46.5mm
39mm
Material
Stainless Steel
Titanium
Water Resistance
300m
200m

Crystal & Dial

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

Movement

3 specs
Caliber
M100 COSC
Sellita SW288
Power Reserve
42h
40h
Complications
COSC
None

Pricing

1 specs
MSRP
$1,768
$949

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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.

Zelos Aurora Moonphase

Owners widely praise Zelos for offering excellent value, solid build quality, and enthusiast-friendly designs, with unique dial variants often selling out quickly. The Zelos Aurora Moonphase is noted as a desirable model, though finding one can be challenging. Some owners find Zelos's designs, including those of the Aurora line, to be too flashy for everyday wear, preferring a more subdued aesthetic. One owner reported their Zelos Aurora Nebula 38mm running at -5.3 seconds per day. Overall, owners rate the Zelos Aurora Moonphase highly for its desirable microbrand status and unique dial appeal.

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