Side by side

Serica Ref. 5303 Diving ChronometervsSeestern S456 GMT

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
S456 GMT
SeesternS456 GMT
MSRP $299

At a glance

16 of 29 specs differ
Diameter
Ref. 5303 Diving Chronometer39mm
S456 GMT41mm
Power Reserve
Ref. 5303 Diving Chronometer42h
S456 GMT41hh
Water Resistance
Ref. 5303 Diving Chronometer300m
S456 GMT200m
MSRP
Ref. 5303 Diving Chronometer$1,768
S456 GMT$299

Full specifications

Case

7 specs
Category
Diver
GMT
Diameter
39mm
41mm
Thickness
12.2mm
13mm
Lug-to-Lug
46.5mm
49mm
Material
Stainless Steel
316L Stainless Steel
Finish
Brushed and polished
Brushed + Polished
Water Resistance
300m
200m

Crystal & Dial

3 specs
AR Coating
Yes
Inner
Dial Color
Enamel Black
Sunray style, applied and Diamond cut Indices, C1 lume
Lume
Super-LumiNova
C1

Movement

5 specs
Caliber
M100 COSC
Seiko NH34
Beat Rate
28,800 vph
3 vph
Power Reserve
42h
41hh
Jewels
25
24
Complications
COSC
GMT

Pricing

1 specs
MSRP
$1,768
$299

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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.

Seestern S456 GMT

Owners widely praise the Seestern S456 GMT for its exceptional value and finishing that exceeds expectations, with one owner noting its accuracy surpasses that of their Seiko 5. The dial displays a pearl-like rainbow effect. Some owners would prefer a bidirectional bezel over the current unidirectional one. The Seestern S456 GMT features an NH34 movement, a 39.5mm case, sapphire crystal, and an adjustable clasp. On balance, owners rate the Seestern S456 GMT highly for its impressive finishing and value proposition at its price point.

From video reviewers

The watch features stunning, detailed finishing that is difficult to top. Reviewers did not reach a consensus on any weaknesses.

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