Side by side

Serica Ref. 5303 Diving ChronometervsLongines FLAGSHIP CLASSIC

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
FLAGSHIP CLASSIC
LonginesFLAGSHIP CLASSIC
MSRP $2,350

At a glance

21 of 29 specs differ
Diameter
Ref. 5303 Diving Chronometer39mm
FLAGSHIP CLASSIC40mm
Power Reserve
Ref. 5303 Diving Chronometer42h
FLAGSHIP CLASSIC72h
Water Resistance
Ref. 5303 Diving Chronometer300m
FLAGSHIP CLASSIC30m
MSRP
Ref. 5303 Diving Chronometer$1,768
FLAGSHIP CLASSIC$2,350

Full specifications

Case

8 specs
Category
Diver
Dress
Diameter
39mm
40mm
Thickness
12.2mm
8.7mm
Lug-to-Lug
46.5mm
47mm
Lug Width
20mm
21mm
Finish
Brushed and polished
Water Resistance
300m
30m
Caseback
Solid

Crystal & Dial

5 specs
Crystal Shape
Flat
AR Coating
Yes
Dial Color
Enamel Black
Silver
Indices
Applied
Lume
Super-LumiNova
None

Movement

7 specs
Caliber
M100 COSC
L888.5
Beat Rate
28,800 vph
0 vph
Power Reserve
42h
72h
Jewels
25
0
Hacking
Yes
No
Hand-winding
Yes
No
Complications
COSC
None

Pricing

1 specs
MSRP
$1,768
$2,350

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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.

Longines FLAGSHIP CLASSIC

Owners widely praise the Longines FLAGSHIP CLASSIC for its faithful vintage design, impressive finishing for the price, and classic sizing, with many appreciating the "marble-like" patina on the cream dial. The watch is considered a strong value, offering great construction and a genuine alligator strap, with some owners finding it a versatile everyday or dress watch. Accuracy is generally reported as decent, and a slim movement contributes to its wearability. However, some owners note the 3-bar water resistance is limiting, and one owner found the 12.4mm thickness and flat caseback made it wear tall and difficult to slip under a cuff. On balance, owners rate the Longines FLAGSHIP CLASSIC highly for its vintage aesthetic and value proposition.

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