Side by side

Seiko 62MASvsTudor Black Bay One 31

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

62MAS
Seiko62MAS
MSRP $1,200
Black Bay One 31
TudorBlack Bay One 31
MSRP $4,600

At a glance

15 of 29 specs differ
Diameter
62MAS40.5mm
Black Bay One 3131mm
Power Reserve
62MAS70h
Black Bay One 3150h
Water Resistance
62MAS200m
Black Bay One 31100m
MSRP
62MAS$1,200
Black Bay One 31$4,600

Full specifications

Case

7 specs
Diameter
40.5mm
31mm
Thickness
13.2mm
9.5mm
Lug-to-Lug
47.6mm
46mm
Lug Width
20mm
17mm
Finish
Brushed and polished
Polished + Satin
Water Resistance
200m
100m
Caseback
Solid
Solid screw-down

Crystal & Dial

4 specs
Crystal Shape
Curved
Flat
AR Coating
Anti-reflective coating on inner surface
Inner
Dial Color
Black
Anthracite
Lume
LumiBrite on hands, index(es) and bezel
None

Movement

3 specs
Caliber
6R35
MT5201
Power Reserve
70h
50h
Jewels
24
25

Pricing

1 specs
MSRP
$1,200
$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 62MAS

The Seiko Prospex Sea 1965 Heritage Diver's Watch is praised for its vintage-inspired finishing, crisp bezel action, and build quality. Owners widely report the movement averages within +/- 10 seconds per day, though some note accuracy issues. The 40mm case size is considered by some to wear larger than expected, and the price point is a subject of debate, with some finding it too high and others fair. The watch features a 72-hour power reserve from the Caliber 6R55 movement, a 300-meter depth rating, and a box-shaped sapphire crystal. On balance, owners and reviewers appreciate the Seiko Prospex Sea 1965 Heritage Diver's Watch for its refined design and solid build quality, despite some reservations about its price and perceived size.

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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