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Seiko Prospex Sea
$1,100Stock unknown
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Case
- Diameter
- 41.3mm
- Thickness
- 12.5mm
- Lug-to-lug
- 48.2mm
- Lug width
- 20mm
- Material
- Stainless Steel
- Water resistance
- 300m
Crystal & dial
- Crystal
- Sapphire
- AR coating
- Anti-reflective coating on inner surface
- Lume
- LumiBrite on hands, index(es) and bezel
Movement
- Caliber
- Seiko 6R55
- Type
- Automatic
- Power reserve
- 72h
- Jewels
- 24
Design language
- Case shape
- round
- Dial style
- textured
- Bezel
- rotating
- Bracelet
- lug-attached
- Hands
- baton
AI-detected from the product image
Prospex Sea collection · 33 watches
20 more in this collection
Prospex Sea 1965 Heritage Diver's WatchProspex Sea 1965 Heritage Diver's Watch PADI Special EditionProspex Sea 1968 Heritage Diver's GMTProspex Sea 1968 Heritage Diver's GMT WatchProspex Sea 1968 Heritage Diver's GMT Watch Limited EditionProspex Sea 1970 Heritage Diver's Black Series Limited EditionProspex Sea 1970 Heritage Diver's Save the Ocean Special EditionProspex Sea JAWS 50th Anniversary Limited EditionProspex Sea PADI Special EditionProspex Sea PADI Special EditionProspex Sea PADI Special EditionProspex Sea PADI Special EditionProspex Sea Save the Ocean Special EditionProspex Sea Save the Ocean Special EditionProspex Sea Save the Ocean Special EditionProspex Sea Seiko Diver’s Watch 60th Anniversary Limited EditionProspex Sea Seiko Diver’s Watch 60th Anniversary Limited EditionProspex Sea Seiko Prospex 1965 Heritage Diver’s Watch Save the Ocean Limited EditionProspex Sea The Black SeriesSumo
3 colorways
The market
4 for sale right now.
2 on eBay and 2 on the forums. Tracked on the secondary market, updated through the day. Not appraisals or offers.
Retail$1,100
On eBay · 2
- Seiko Prospex Diver's Gray Dial Rose Gold Bezel Automatic Watch 41mm SPB485Pre-owned - Excellent · US$825
- Seiko Prospex Sea Diver 300mm Gray Dial Made in Japan Automatic Watch SPB485New with box and papers · US$899
On the forums · 2Market+
History only · Watch family · 11 weeks, Jul 7, 2025 to Aug 31, 2026
Seiko on the secondhand market
+7.9%
2026 so far · +3.5% to +12.7% · 75 matched watches
In line with the index
Divers as a group: +7.1% · 297 matched watches
Year-by-year readings →Market+ adds the forum listings and the weekly trend.
The connection engine
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The community take
Owners talk.
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.
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