Side by side

Seiko Prospex LX linevsTudor Black Bay One 31

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

Prospex LX line
SeikoProspex LX line
MSRP $6,500
Black Bay One 31
TudorBlack Bay One 31
MSRP $4,600

At a glance

16 of 29 specs differ
Diameter
Prospex LX line44.8mm
Black Bay One 3131mm
Power Reserve
Prospex LX line72h
Black Bay One 3150h
Water Resistance
Prospex LX line300m
Black Bay One 31100m
MSRP
Prospex LX line$6,500
Black Bay One 31$4,600

Full specifications

Case

8 specs
Diameter
44.8mm
31mm
Thickness
15.7mm
9.5mm
Lug-to-Lug
50.9mm
46mm
Lug Width
22mm
17mm
Material
Titanium
Stainless Steel
Finish
Brushed and polished
Polished + Satin
Water Resistance
300m
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

4 specs
Caliber
5R65
MT5201
Type
Spring Drive
Automatic
Power Reserve
72h
50h
Jewels
30
25

Pricing

1 specs
MSRP
$6,500
$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 Prospex LX line

Owners widely report the Seiko Prospex LX line's finishing is a step up from other models, with a case that sits well on the wrist, and some praise the green sunburst dial with blue anti-reflective sapphire crystal as phenomenal. However, owners note the high MSRP limited sales, with some desiring smaller cases and a reduced price, and others experienced quality control issues such as detached second hands and peeling DLC coating, leading to concerns about fragility. On balance, owners feel the Seiko Prospex LX line was discontinued due to pricing that alienated its target market, despite its attractive dial.

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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