Side by side

Seiko King TurtlevsTudor Black Bay One 31

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

King Turtle
SeikoKing Turtle
MSRP $650
Black Bay One 31
TudorBlack Bay One 31
MSRP $4,600

At a glance

14 of 29 specs differ
Diameter
King Turtle45mm
Black Bay One 3131mm
Power Reserve
King Turtle41h
Black Bay One 3150h
Water Resistance
King Turtle200m
Black Bay One 31100m
MSRP
King Turtle$650
Black Bay One 31$4,600

Full specifications

Case

7 specs
Diameter
45mm
31mm
Thickness
13.2mm
9.5mm
Lug-to-Lug
47.7mm
46mm
Lug Width
22mm
17mm
Finish
Brushed and polished
Polished + Satin
Water Resistance
200m
100m
Caseback
Solid
Solid screw-down

Crystal & Dial

3 specs
AR Coating
Anti-reflective coating on inner surface
Inner
Dial Color
Black
Anthracite
Lume
LumiBrite on hands and index(es)
None

Movement

3 specs
Caliber
4R36
MT5201
Power Reserve
41h
50h
Jewels
24
25

Pricing

1 specs
MSRP
$650
$4,600

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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.

Seiko King Turtle

Owners widely praise the Seiko Prospex Sea for its excellent value, robust build, and superior lume, with many appreciating its faithful recreation of classic designs and proven movements like the 4R36 and 6R15. Reviewers highlight impressive case finishing and durability, noting that even larger models wear smaller than expected due to thoughtful case design. Some owners find the solar quartz models a great entry point, appreciating their design and solar functionality. However, specific variants receive critiques: the bracelet clasp on the Samurai is described as underwhelming, and the Sumo's bracelet width and clasp are seen as too narrow and rudimentary, respectively. The SPB183 is considered expensive for a Japanese watch, and its lume is noted as not quite matching older Seiko Monster models. The GMT function on the SPB519 is deemed less practical for serious travel, and its bezel clicks are described as quieter and mushier.

Tudor Black Bay One 31

Owners widely report the Tudor Black Bay One 31's polished case and bracelet scratch easily, though its wearability under gloves and robust movement are praised. Some desire more micro-adjustment options on the clasp, and a lack of contrast between the silver dial and hands is noted. The 31mm size may be a consideration for daily wear due to its 50-hour power reserve. On balance, owners and reviewers appreciate the Tudor Black Bay One 31 for its comfortable wearability and robust movement, despite concerns about case scratching and clasp adjustability.

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