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Seiko
Seiko's day-date automatic caliber and the in-house branded version of the NH36 with stricter quality control and finishing. The additional day wheel over the 4R35 adds the day-of-week complication without changing the movement dimensions. Found extensively in the Seiko 5 Sports and Prospex lines, it offers Seiko's proven reliability with the convenience of day-date display at a mainstream price point.
AI-detected from the product image
Prospex Sea collection · 33 watches
2 colorways
The living market
Tracked on the secondary market, updated through the day. Not appraisals or offers.
No confirmed active listings.
Observed range · Watch family · 60 weeks, Jan 18, 2021–Jul 6, 2026 · 10 recent or historical posts
Seiko on the secondhand market
+7.9%
2026 so far · +3.2% to +12.7% · 75 matched watches
In line with the index
Divers as a group: +7.4% · 297 matched watches
Year-by-year readings →The connection engine
The community take
The Seiko Prospex Sea Save the Ocean Special Edition is widely praised for its attractive, unique, and textured dials, often described as having a "Grand Seiko feel" at a more accessible price point, with specific mentions of wave patterns, lagoon hues, and manta ray motifs. Owners appreciate the smooth bezel operation and satisfactory lume. Accuracy figures vary, with one owner reporting +5 seconds per day, while another notes a range from +1/+2 to about -6 seconds per day. The 6R35 movement offers a 70-hour power reserve, and some models feature sapphire crystals. Criticisms include a desire for exhibition casebacks and concerns about the quality and security of the stamped metal clasps and bracelets, which are frequently described as rattly or underwhelming, though this is noted as a common Seiko trait. Some owners are split on the number of Save the Ocean variations and dislike the cyclops magnifier.
On real wrists · 1
The paper trail
The matchups people make with the Seiko Prospex Sea Save the Ocean Special Edition most — open one to see it side by side.
Orient M-Force AC0Nvs Seiko Prospex Sea Save the Ocean Special Edition
Christopher Ward C60 Trident GMT 300vs Seiko Prospex Sea Save the Ocean Special Edition
Pompeak Sub-Aquaticvs Seiko Prospex Sea Save the Ocean Special Edition
Glycine Combat 6 Vintagevs Seiko Prospex Sea Save the Ocean Special EditionThe discussion