Side by side

Serica Ref. 5303 Diving ChronometervsOrient Bambino Open Heart

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
Bambino Open Heart
OrientBambino Open Heart
MSRP $315

At a glance

19 of 29 specs differ
Diameter
Ref. 5303 Diving Chronometer39mm
Bambino Open Heart40.5mm
Power Reserve
Ref. 5303 Diving Chronometer42h
Bambino Open Heart40h
Water Resistance
Ref. 5303 Diving Chronometer300m
Bambino Open Heart30m
MSRP
Ref. 5303 Diving Chronometer$1,768
Bambino Open Heart$315

Full specifications

Case

7 specs
Category
Diver
Diameter
39mm
40.5mm
Thickness
12.2mm
12mm
Lug-to-Lug
46.5mm
46mm
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
White
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
$315

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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.

Orient Bambino Open Heart

Owners widely praise the Orient Bambino Open Heart for its dressy style, clean dial, and reliable in-house F6724 automatic movement with hacking and hand-winding. Reviewers and owners highlight its value proposition, with one owner noting it remains a regular wear even after acquiring pricier watches. Some owners find the build quality and stock strap less premium, with one noting the mineral crystal is prone to scratching and another that the movement can be noisy. The 21mm lug width is cited as making strap swapping slightly more complicated. Overall, owners and reviewers rate the Orient Bambino Open Heart highly for its dressy aesthetic and in-house movement at its price point.

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