Side by side

Seestern S456 GMTvsTudor Black Bay

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

S456 GMT
SeesternS456 GMT
MSRP $299
Black Bay
TudorBlack Bay

At a glance

15 of 29 specs differ
Diameter
S456 GMT41mm
Black Bay41mm
Power Reserve
S456 GMT41hh
Black Bay70h
Water Resistance
S456 GMT200m
Black Bay200m
MSRP
S456 GMT$299
Black Bay

Full specifications

Case

7 specs
Category
GMT
Diver
Thickness
13mm
14.7mm
Lug-to-Lug
49mm
46mm
Lug Width
20mm
22mm
Material
316L Stainless Steel
Stainless Steel
Finish
Brushed + Polished
Polished + Satin
Caseback
Solid
Engraved

Crystal & Dial

2 specs
Dial Color
Sunray style, applied and Diamond cut Indices, C1 lume
Black
Lume
C1
None

Movement

5 specs
Caliber
Seiko NH34
MT5602
Beat Rate
3 vph
28,800 vph
Power Reserve
41hh
70h
Jewels
24
25
Complications
GMT
None

Pricing

1 specs
MSRP
$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.

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.

Tudor Black Bay

Owners widely praise the Tudor Black Bay for its comfortable wearability, robust build, and vintage-inspired aesthetics, with specific mentions of its satisfying winding feel and sturdy bezel action. Reviewers highlight the 39mm Black Bay 58's comfortable size and thinness, while others note the 41mm Master Chronometer's reliable timekeeping and magnetic resistance. Some owners find the GMT hand difficult to distinguish in low light. A recurring point of contention across multiple sources is the lack of on-the-fly micro-adjustment on the bracelet, though some find aftermarket solutions adequate. One owner reported the watch losing two minutes a day after six years, requiring a service. Overall, owners and reviewers rate the Tudor Black Bay highly for its blend of vintage charm, modern robustness, and comfortable wearability.

From video reviewers

The COSC-certified accuracy of the movement is a notable strength. The 14.7mm to 14.8mm thickness is cited as a potential drawback. Reviewers are divided on whether the newer models represent a departure from the Black Bay's heritage design.

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