Seiko Prospex SeavsSynchron Ti300M Poseidon Deep Black
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Measurements
Catalog photos are all shot at the same flattering size. These aren't: every case below shares one millimeter scale.
Prospex Sea
Ti300M Poseidon Deep Black
Diameter
41.7mm
41mm
Lug-to-Lug
49.5mm
45mm
lowest
Thickness
12.3mm
11.9mm
lowest
Water Resistance
200m
300m
highest
Power Reserve
41h
60h
highest
MSRP
$595
lowest
$1,490
Movement
Seiko 4R35
La Joux-Perret G100
Case
5 specsCrystal & Dial
4 specsMovement
3 specsPricing
1 specsReviews
Synthesized for each watch independently from owner discussions, enthusiast forums, written reviews, and video reviewers.
Owners widely report the Seiko Prospex Sea is a well-built watch at a fair price, with some finding its 41.7mm case size perfect while others with smaller wrists consider it big, thick, and heavy. Reviewers consistently praise the excellent lume and robust design. One owner notes the bezel action is smoother and more precise than some other Seiko divers. Overall, owners and reviewers rate the Seiko Prospex Sea highly for its value and proven design.
The Synchron Ti300M Poseidon Deep Black is praised for its wearability, attributed to its lightweight titanium construction and a 11.9mm case thickness, making it comfortable even under a cuff. Reviewers note its retro aesthetic and good legibility with a glossy black dial. Owners and reviewers find the La Joux-Perret G100 movement to be a high-grade caliber. The watch is considered a good value, with some sources citing a price around $990-$999. On balance, owners and reviewers rate the Synchron Ti300M Poseidon Deep Black highly for its comfortable titanium build and attractive vintage-inspired design at its price point.
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