Side by side

Seiko Prospex SeavsTudor Black Bay 68

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

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 Sea

Seiko Prospex Sea owners and reviewers praise its Marinemaster-style aesthetic, excellent case finishing, and impressive LumiBrite lume. The watch is powered by the 6R15 movement with a 50-hour power reserve and comes with both a steel bracelet and a silicone strap. Some owners find the Seiko Prospex Sea to be a great value and a suitable first "proper" watch, while others report it is uncomfortably big, thick, and heavy on smaller wrists. Reviewers note the GMT function is secondary with a less prominent scale, and the bezel's quieter clicks may not appeal to all. On balance, owners and reviewers rate the Seiko Prospex Sea highly for its classic design and finishing at its price point.

Tudor Black Bay 68

The Tudor Black Bay 68 is praised for its METAS Master Chronometer-certified MT5601-U movement, which provides superior accuracy of -2/+4 seconds per day and a 70-hour power reserve. Reviewers highlight its comfortable 13.6mm thickness and the appeal of the Tudor blue dial with a matte black bezel insert. The watch features a brushed and polished 43mm case, a domed sapphire crystal, and a bracelet without faux rivets. On balance, reviewers find the Tudor Black Bay 68 a sensible, larger vintage-inspired diver with excellent timekeeping.

From video reviewers

The 43mm steel case and T-Fit bracelet are consistently mentioned. The substantial 51.6mm-51.7mm lug-to-lug measurement is a point of concern for wearability on smaller wrists. Reviewers are split on the value proposition compared to other Black Bay models.

At a glance

13 of 29 specs differ
Diameter
Prospex Sea43.5mm
Black Bay 6843mm
Power Reserve
Prospex Sea70h
Black Bay 6870h
Water Resistance
Prospex Sea200m
Black Bay 68200m
MSRP
Prospex Sea$1,500
Black Bay 68$5,475

Full specifications

Case

6 specs
Diameter
43.5mm
43mm
Thickness
13.3mm
13.6mm
Lug-to-Lug
51mm
0mm
Material
Titanium
Stainless Steel
Finish
Polished + Satin
Caseback
Solid screw-down

Crystal & Dial

4 specs
AR Coating
Anti-reflective coating on inner surface
Dial Color
Blue
Indices
Applied
Lume
LumiBrite on hands and index(es)
None

Movement

2 specs
Caliber
6R35
MT5601-U
Jewels
24
0

Pricing

1 specs
MSRP
$1,500
$5,475
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