Side by side

Serica Ref. 5303 Diving ChronometervsGlycine Combat Sub

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
Combat Sub
GlycineCombat Sub
MSRP $1,850

At a glance

17 of 29 specs differ
Diameter
Ref. 5303 Diving Chronometer39mm
Combat Sub42mm
Power Reserve
Ref. 5303 Diving Chronometer42h
Combat Sub38h
Water Resistance
Ref. 5303 Diving Chronometer300m
Combat Sub200m
MSRP
Ref. 5303 Diving Chronometer$1,768
Combat Sub$1,850

Full specifications

Case

7 specs
Diameter
39mm
42mm
Thickness
12.2mm
10.45mm
Lug-to-Lug
46.5mm
Lug Width
20mm
22mm
Finish
Brushed and polished
Water Resistance
300m
200m
Caseback
Solid

Crystal & Dial

5 specs
Crystal Shape
Flat
AR Coating
Yes
Dial Color
Enamel Black
Black
Indices
Applied
Lume
Super-LumiNova
Luminous

Movement

4 specs
Caliber
M100 COSC
SW200-1
Power Reserve
42h
38h
Jewels
25
26
Complications
COSC
Date

Pricing

1 specs
MSRP
$1,768
$1,850

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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.

Glycine Combat Sub

Owners widely praise the Glycine Combat Sub for its exceptional thinness, with many noting its 10.4mm to 10.8mm profile for a diver, perfect proportions, and solid build quality that offers significant value, especially at discounted prices. Its unique aesthetic is appreciated for avoiding homage looks, and the lug design contributes to a smaller perceived wear size despite its 42mm case. Some owners report an inconsistent power reserve and sub-par lume that can be difficult to read at night, while one owner noted a slightly off-color lume pip on the chapter ring. Overall, owners rate the Glycine Combat Sub highly for its refined feel, slim profile, and value proposition.

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