Side by side

Serica Ref. 5303 Diving ChronometervsOrient Helios

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
Helios
OrientHelios
MSRP $335
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.

Orient Helios

The Orient Helios is widely praised for its vibrant dial, open-heart design, and excellent value for money, with owners noting its great finish and quality that exceeds its price point. The watch is described as attractive and stylish, with a thin profile that wears comfortably, though some owners wish it were smaller. Accuracy figures vary, with one owner reporting it consistently runs 5-6 seconds fast per day, while another sees it at 1-2 seconds fast. Opinions are split on the inclusion of a date window, with some finding it desirable for practicality and aesthetic balance, while others prefer its absence. The stock bracelet receives mixed reviews, with one owner finding it awkward and upgrading to a strap, while another considers it nice with a smooth finish and solid links. Overall, owners rate the Orient Helios highly for its mesmerizing open-heart dial and impressive quality at an attainable price.

At a glance

19 of 29 specs differ
Diameter
Ref. 5303 Diving Chronometer39mm
Helios40.5mm
Power Reserve
Ref. 5303 Diving Chronometer42h
Helios40h
Water Resistance
Ref. 5303 Diving Chronometer300m
Helios30m
MSRP
Ref. 5303 Diving Chronometer$1,768
Helios$335

Full specifications

Case

7 specs
Category
Diver
Diameter
39mm
40.5mm
Thickness
12.2mm
12mm
Lug-to-Lug
46.5mm
47mm
Lug Width
20mm
21mm
Water Resistance
300m
30m
Caseback
Solid
Display

Crystal & Dial

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

Movement

5 specs
Caliber
M100 COSC
FT622
Beat Rate
28,800 vph
21,600 vph
Power Reserve
42h
40h
Jewels
25
22
Complications
COSC
None

Pricing

1 specs
MSRP
$1,768
$335
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