Side by side

Serica Ref. 5303 Diving ChronometervsLongines CONQUEST

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
CONQUEST
LonginesCONQUEST
MSRP $900

At a glance

19 of 29 specs differ
Diameter
Ref. 5303 Diving Chronometer39mm
CONQUEST41mm
Power Reserve
Ref. 5303 Diving Chronometer42h
CONQUEST40h
Water Resistance
Ref. 5303 Diving Chronometer300m
CONQUEST300m
MSRP
Ref. 5303 Diving Chronometer$1,768
CONQUEST$900

Full specifications

Case

6 specs
Diameter
39mm
41mm
Thickness
12.2mm
11.8mm
Lug-to-Lug
46.5mm
51mm
Lug Width
20mm
21mm
Finish
Brushed and polished
Caseback
Solid
Screw-down case back

Crystal & Dial

4 specs
Crystal Shape
Flat
AR Coating
Yes
Underside
Dial Color
Enamel Black
Blue
Indices
Applied
Applied Arabic numerals and indexes

Movement

8 specs
Caliber
M100 COSC
L157.3
Type
Automatic
Quartz
Beat Rate
28,800 vph
25,200 vph
Power Reserve
42h
40h
Jewels
25
0
Hacking
Yes
No
Hand-winding
Yes
No
Complications
COSC
Hours, minutes, seconds and date

Pricing

1 specs
MSRP
$1,768
$900

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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 CONQUEST

Owners widely praise the Longines CONQUEST for its excellent finishing, comfortable wearability, and strong value, with many highlighting its versatility and smooth hand-winding action. Specific points of praise include the clean design, 30 ATM water resistance, and curved lugs contributing to comfort. However, reviewers and owners consistently note the bracelet's lack of micro-adjustment and the lume is considered poor by multiple sources. Some find the design too simple, and one owner felt the watch was underwhelming in person. On balance, owners rate the Longines CONQUEST highly for its exceptional finishing and value at its price point.

From video reviewers

The sunburst dial is a frequently praised aesthetic feature. Reviewers noted the quartz movement as a potential drawback for enthusiasts seeking automatic options.

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