Side by side

Seiko Prospex SeavsTissot Gentleman Open Heart

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

Prospex Sea
SeikoProspex Sea
MSRP $900
Gentleman Open Heart
TissotGentleman Open Heart
MSRP $1,025
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

Owners widely praise the Seiko Prospex Sea for its excellent lume, robust build, and value, with many highlighting the comfortable 4 o'clock crown and reliable movements. Reviewers note impressive case finishing and attractive dials, with specific models lauded for their gradient blue designs and smooth bezel actions. Accuracy figures vary, with one owner reporting +9 seconds/day after demagnetization, while others find the watches to be good first "proper" watches. Some owners find the stock rubber straps uncomfortable or the overall size substantial on smaller wrists. On balance, owners and reviewers rate the Seiko Prospex Sea highly for its combination of strong dive watch functionality and appealing design at its price point.

Tissot Gentleman Open Heart

Owners widely praise the Tissot Gentleman Open Heart for its versatile dressy-sporty aesthetic and elegant sunburst dial finish, with one owner preferring its less shiny blue dial compared to other versions. The watch offers excellent fit and bracelet adjustability, and its modified Powermatic 80 movement achieves COSC-level accuracy of -3 to +5 seconds/day, though the seconds hand movement is slightly less smooth at 6 movements per second. However, one owner reported the watch arrived non-functional, requiring a return due to an inoperable movement. On balance, owners rate the Tissot Gentleman Open Heart highly for its aesthetic appeal and accurate timekeeping, despite a reported instance of a faulty movement.

At a glance

15 of 29 specs differ
Diameter
Prospex Sea41mm
Gentleman Open Heart40mm
Power Reserve
Prospex Sea70h
Gentleman Open Heart80h
Water Resistance
Prospex Sea200m
Gentleman Open Heart100m
MSRP
Prospex Sea$900
Gentleman Open Heart$1,025

Full specifications

Case

6 specs
Category
Diver
Chronograph
Diameter
41mm
40mm
Thickness
12.3mm
11.5mm
Lug-to-Lug
46.9mm
40mm
Lug Width
20mm
21mm
Water Resistance
200m
100m

Crystal & Dial

5 specs
Crystal Shape
Curved
Domed
AR Coating
Anti-reflective coating on inner surface
Yes
Dial Color
Black
Silver
Indices
Applied
Indexes
Lume
LumiBrite on hands, index(es) and bezel
Super-LumiNova ®

Movement

3 specs
Caliber
6R35
11.5'
Power Reserve
70h
80h
Jewels
24
25

Pricing

1 specs
MSRP
$900
$1,025
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