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

16 of 29 specs differ
Diameter
Ref. 5303 Diving Chronometer39mm
Combat Sub36mm
Power Reserve
Ref. 5303 Diving Chronometer42h
Combat Sub38h
Water Resistance
Ref. 5303 Diving Chronometer300m
Combat Sub300m
MSRP
Ref. 5303 Diving Chronometer$1,768
Combat Sub$1,850

Full specifications

Case

6 specs
Diameter
39mm
36mm
Thickness
12.2mm
12mm
Lug-to-Lug
46.5mm
Lug Width
20mm
18mm
Finish
Brushed and polished
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

The Glycine Combat Sub is widely praised for its excellent value, thin case height (ranging from 10.4mm to 10.8mm), and comfortable wearability due to downward-curving lugs, with owners noting its quality and finishing punch well above its price point. Reviewers and owners consistently highlight its smooth bezel action, crisp font, and a unique aesthetic that avoids being a direct homage. However, criticisms include sub-par lume that is difficult to read in low light and an inconsistent power reserve, with some owners suggesting it may require servicing. Opinions are split on the 42mm size, with some finding it perfect and others preferring a smaller variant. On balance, owners and reviewers rate the Glycine Combat Sub highly for its exceptional thinness and quality finishing at its price point.

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