Side by side

Ollech & Wajs AstrochronvsSeiko Prospex Sea

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

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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.

Ollech & Wajs Astrochron

The watch features a highly legible dial and a robust 500-meter water-resistant case. Reviewers did not raise any shared weaknesses.

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.

At a glance

12 of 29 specs differ
Diameter
Astrochron39.5mm
Prospex Sea41.3mm
Power Reserve
Astrochron54h
Prospex Sea72h
Water Resistance
Astrochron500m
Prospex Sea300m
MSRP
Astrochron$2,796
Prospex Sea$1,100

Full specifications

Case

6 specs
Category
Diver
Diameter
39.5mm
41.3mm
Thickness
0mm
12.5mm
Lug-to-Lug
0mm
48.2mm
Lug Width
0mm
20mm
Water Resistance
500m
300m

Crystal & Dial

2 specs
AR Coating
Anti-reflective coating on inner surface
Lume
None
LumiBrite on hands, index(es) and bezel

Movement

3 specs
Caliber
Valjoux 7753
Seiko 6R55
Power Reserve
54h
72h
Jewels
0
24

Pricing

1 specs
MSRP
$2,796
$1,100
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