Side by side

Serica Ref. 5303 Diving ChronometervsFormex Stratos UTC

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
Stratos UTC
FormexStratos UTC
MSRP $4,663

At a glance

10 of 29 specs differ
Diameter
Ref. 5303 Diving Chronometer39mm
Stratos UTC41mm
Power Reserve
Ref. 5303 Diving Chronometer42h
Stratos UTC42h
Water Resistance
Ref. 5303 Diving Chronometer300m
Stratos UTC100m
MSRP
Ref. 5303 Diving Chronometer$1,768
Stratos UTC$4,663

Full specifications

Case

5 specs
Category
Diver
GMT
Diameter
39mm
41mm
Thickness
12.2mm
11.8mm
Lug-to-Lug
46.5mm
47mm
Water Resistance
300m
100m

Crystal & Dial

2 specs
AR Coating
Yes
Inner
Dial Color
Enamel Black
Blue

Movement

2 specs
Caliber
M100 COSC
ETA 2892
Complications
COSC
None

Pricing

1 specs
MSRP
$1,768
$4,663

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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 Stratos UTC

Owners and reviewers widely praise the Formex Stratos UTC for its user-friendly flyer GMT complication, which utilizes pushers for time-zone adjustments, and its slim 11.8mm case. The watch is noted for its intricate, hand-finished case with a multi-layer construction and excellent finishing, along with a unique two-level case design. The Dubois-Depraz module on an ETA 2892 movement is a highlight, with accuracy figures ranging from +/- 5 to +/- 7 seconds per day. However, some find the dial busy with multiple typefaces and the overall design too complex or "plug ugly," with the price near €4000 considered high by some for a newer brand. Overall, owners and reviewers rate the Formex Stratos UTC highly for its innovative GMT functionality and excellent case finishing at its price point.

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