Side by side

Serica Ref. 5303 Diving ChronometervsHELM Miyako

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
Miyako
HELMMiyako
MSRP $375

At a glance

12 of 29 specs differ
Diameter
Ref. 5303 Diving Chronometer39mm
Miyako40mm
Power Reserve
Ref. 5303 Diving Chronometer42h
Miyako42h
Water Resistance
Ref. 5303 Diving Chronometer300m
Miyako200m
MSRP
Ref. 5303 Diving Chronometer$1,768
Miyako$375

Full specifications

Case

5 specs
Diameter
39mm
40mm
Thickness
12.2mm
13.75mm
Lug-to-Lug
46.5mm
47mm
Lug Width
20mm
22mm
Water Resistance
300m
200m

Crystal & Dial

2 specs
Crystal Shape
Flat
Double-Domed
Dial Color
Enamel Black
Gray

Movement

4 specs
Caliber
M100 COSC
Power Reserve
42h
42h
Jewels
25
24
Complications
COSC
None

Pricing

1 specs
MSRP
$1,768
$375

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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.

HELM Miyako

HELM Miyako owners widely praise its exceptional value and quality, with multiple reports highlighting its stunning appearance and dial details. The watch is noted for its excellent accuracy, with figures around +1.5 to +2 seconds per day. One owner found the HELM Miyako to be tough and versatile, fitting well on a 6.6-inch wrist. Overall, owners consider the HELM Miyako an amazing value and a great watch, worth the wait for its availability.

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