Side by side

Serica Ref. 5303 Diving ChronometervsLongines MASTER COLLECTION

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
MASTER COLLECTION
LonginesMASTER COLLECTION
MSRP $4,850

At a glance

21 of 29 specs differ
Diameter
Ref. 5303 Diving Chronometer39mm
MASTER COLLECTION40mm
Power Reserve
Ref. 5303 Diving Chronometer42h
MASTER COLLECTION72h
Water Resistance
Ref. 5303 Diving Chronometer300m
MASTER COLLECTION30m
MSRP
Ref. 5303 Diving Chronometer$1,768
MASTER COLLECTION$4,850

Full specifications

Case

9 specs
Category
Diver
Diameter
39mm
40mm
Thickness
12.2mm
9.35mm
Lug-to-Lug
46.5mm
46.8mm
Lug Width
20mm
21mm
Material
Stainless Steel
Gold
Finish
Brushed and polished
Water Resistance
300m
30m
Caseback
Solid
Transparent case back with sapphire crystal

Crystal & Dial

4 specs
Crystal Shape
Flat
AR Coating
Yes
Dial Color
Enamel Black
Silver
Indices
Applied
Diamond indexes

Movement

7 specs
Caliber
M100 COSC
L888.5
Beat Rate
28,800 vph
25,200 vph
Power Reserve
42h
72h
Jewels
25
0
Hacking
Yes
No
Hand-winding
Yes
No
Complications
COSC
Hours, minutes, seconds and date

Pricing

1 specs
MSRP
$1,768
$4,850

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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 MASTER COLLECTION

The Longines Master Collection is widely praised for its excellent fit and finish, heritage-inspired design with engraved Breguet numerals, and dial textures, offering tremendous value. Owners appreciate its dressy, thin profile and the use of ETA movements, with specific models featuring triple-date, annual calendar, or moonphase chronograph complications. Some reviewers note the subdial cutting off the "7" on the Small Seconds model, the lack of micro-adjustments on the bracelet for a perfect fit, and a somewhat homogenous case finishing. The 30m water resistance on the Annual Calendar is considered light, and the traditional styling is not as popular as sport watches. The Master Collection Chronograph is lauded for its classic, vintage styling. Overall, owners rate the Longines Master Collection highly for its value and classic dress watch aesthetics.

From video reviewers

The movement accuracy is consistently praised. Reviewers noted the elegant and timeless design.

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