Side by side

Seiko Prospex SeavsSeiko Prospex SPEEDTIMER Mechanical

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 models are widely praised for their excellent build quality, value for money, and comfortable wearability, with many appreciating the vintage-inspired designs and robust construction. Owners note the silicone straps are surprisingly comfortable and well-finished, and the Lumibrite lume is excellent. However, some find the 44.3mm size and thickness too large for smaller wrists, though others report the sizing as perfect. The 6R15 movement in some variants offers accuracy around +4 seconds per day with a 50-hour power reserve, while newer movements offer more. Some models are criticized for a bracelet width not matching the case size or a rudimentary clasp for their price point. Overall, owners and reviewers rate the Seiko Prospex Sea highly for its impressive case work and finishing at its price point.

Seiko Prospex SPEEDTIMER Mechanical

The Seiko Prospex SPEEDTIMER Mechanical is praised for its visually appealing design and comfortable wearability, with owners frequently using its chronograph function for daily tasks. Reviewers note its clean dial layout and LumiBrite treated hands and markers, and one source highlights the 72-hour power reserve of the 6R55 movement. However, some owners criticize its chronograph functionality and the 24-hour subdial. On balance, owners and reviewers rate the Seiko Prospex SPEEDTIMER Mechanical highly for its daily usability and refined aesthetics.

At a glance

8 of 29 specs differ
Diameter
Prospex Sea41.3mm
Prospex SPEEDTIMER Mechanical39.5mm
Power Reserve
Prospex Sea72h
Prospex SPEEDTIMER Mechanical72h
Water Resistance
Prospex Sea300m
Prospex SPEEDTIMER Mechanical200m
MSRP
Prospex Sea$1,100
Prospex SPEEDTIMER Mechanical$995

Full specifications

Case

5 specs
Category
Diver
Chronograph
Diameter
41.3mm
39.5mm
Thickness
12.5mm
12mm
Lug-to-Lug
48.2mm
44.5mm
Water Resistance
300m
200m

Crystal & Dial

2 specs
Crystal Shape
Curved
Lume
LumiBrite on hands, index(es) and bezel
LumiBrite on hands and index(es)

Pricing

1 specs
MSRP
$1,100
$995
Keep exploring

More watches worth a look

Matched to the watches above on size, movement, style and price — microbrands first. Open any one to dig in.

Follow this matchup

Get a note when Seiko Prospex Sea vs Seiko Prospex SPEEDTIMER Mechanical gets more votes, a community discussion, or a price drop. No account needed.

Adjacent matchups

People also compared

Comparisons nearby in the catalog — alternatives to the watches above paired against the matchup.