Side by side

Seestern S456 GMTvsSeiko Prospex Sea

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

S456 GMT
SeesternS456 GMT
MSRP $299
Prospex Sea
SeikoProspex Sea
MSRP $595

At a glance

15 of 29 specs differ
Diameter
S456 GMT41mm
Prospex Sea41.7mm
Power Reserve
S456 GMT41hh
Prospex Sea41h
Water Resistance
S456 GMT200m
Prospex Sea200m
MSRP
S456 GMT$299
Prospex Sea$595

Full specifications

Case

6 specs
Category
GMT
Diver
Diameter
41mm
41.7mm
Thickness
13mm
12.3mm
Lug-to-Lug
49mm
49.5mm
Material
316L Stainless Steel
Stainless Steel
Finish
Brushed + Polished
Brushed and polished

Crystal & Dial

3 specs
Crystal
Sapphire
Hardlex
Dial Color
Sunray style, applied and Diamond cut Indices, C1 lume
Black
Lume
C1
LumiBrite on hands, index(es) and bezel

Movement

5 specs
Caliber
Seiko NH34
4R35
Beat Rate
3 vph
28,800 vph
Power Reserve
41hh
41h
Jewels
24
23
Complications
GMT
None

Pricing

1 specs
MSRP
$299
$595

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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.

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.

Seiko Prospex Sea

Owners and reviewers widely praise the Seiko Prospex Sea for its excellent value, robust build, and superior lume, with many noting its comfortable wearability and faithful design recreations. Some owners report the watch can feel big, thick, and heavy on smaller wrists, while others find the sizing perfect. The bezel action is frequently highlighted as smooth and precise, often exceeding that of less expensive models. On balance, owners and reviewers rate the Seiko Prospex Sea highly for its impressive finishing and value proposition.

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