MKII Project 300vsSeiko Prospex Sea
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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.
Project 300
Prospex Sea
Diameter
41.3mm
41mm
Lug-to-Lug
48mm
46.9mm
lowest
Thickness
13.4mm
12.3mm
lowest
Water Resistance
300m
highest
200m
Power Reserve
n/a
70h
MSRP
$1,995
$900
lowest
Movement
ETA 2824-2
Seiko 6R35
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 praise the MKII Project 300 for its balanced design, with one owner noting its lume "glows like a torch." Reviewers highlight its high legibility and bold, balanced aesthetic, inspired by classic dive watches. One owner found the 41.25mm case fit their wrist perfectly. Overall, owners and reviewers rate the MKII Project 300 highly for its exceptional lume and well-proportioned dive watch design.
The 39.5mm case size fits most wrists well. The watch offers 200M water resistance. Reviewers did not reach a consensus on any weaknesses or points of disagreement.
Owners widely praise the Seiko Prospex Sea for its value and robust build, with many highlighting its excellent lume and attractive design. Some owners find the 41mm case size perfect, while others with smaller wrists consider it too large, thick, and heavy. The stock rubber strap is noted as uncomfortable for land wear by one owner. Overall, owners rate the Seiko Prospex Sea highly for its design and value at the price point.
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