Side by side

Serica Ref. 5303 Diving ChronometervsFormex Essence ThirtyNine

The numbers, the dial colors, the calibers — laid out so you can stop flipping between tabs.

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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.

Formex Essence ThirtyNine

The Formex Essence ThirtyNine is praised for its impressive build quality and value, featuring a patented case suspension system for comfort and protection. It houses a COSC-certified Sellita SW200-1 movement with a 38-hour power reserve and a tool-free strap quick-release system. A minor inconvenience noted is the specific closing order of the clasp. On balance, reviewers rate the Formex Essence ThirtyNine highly for its comfortable wearability and excellent value at its price point.

From video reviewers

The case suspension system enhances comfort and the COSC-certified movement is a strong feature. The bracelet exhibits noticeable rattle. Reviewers disagreed on the ideal case size, with some preferring the 39mm and others the 41mm.

At a glance

11 of 29 specs differ
Diameter
Ref. 5303 Diving Chronometer39mm
Essence ThirtyNine39mm
Power Reserve
Ref. 5303 Diving Chronometer42h
Essence ThirtyNine41h
Water Resistance
Ref. 5303 Diving Chronometer300m
Essence ThirtyNine100m
MSRP
Ref. 5303 Diving Chronometer$1,768
Essence ThirtyNine$2,390

Full specifications

Case

5 specs
Category
Diver
Dress
Thickness
12.2mm
10mm
Lug-to-Lug
46.5mm
45mm
Lug Width
0mm
20mm
Water Resistance
300m
100m

Crystal & Dial

2 specs
AR Coating
Yes
Dial Color
Enamel Black
Space Ghost

Movement

3 specs
Caliber
Soprod M100
Sellita SW200-1
Power Reserve
42h
41h
Complications
COSC
None

Pricing

1 specs
MSRP
$1,768
$2,390
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