SpecStudio
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Seiko Prospex Sea 1970 Heritage Diver's Save the Ocean Special Edition
$1,350Stock unknown
Case
- Diameter
- 42.7mm
- Thickness
- 13.2mm
- Lug-to-lug
- 46.4mm
- Lug width
- 20mm
- Material
- Stainless Steel
- Water resistance
- 200m
Crystal & dial
- Crystal
- Sapphire
- Shape
- Curved
- AR coating
- Anti-reflective coating on inner surface
- Lume
- LumiBrite on hands, index(es) and bezel
Movement
- Caliber
- Seiko 6R35
- Type
- Automatic
- Power reserve
- 70h
- Jewels
- 24
Seiko
Seiko's upgraded automatic caliber offering a substantial 70-hour power reserve, nearly double the 4R35 it replaces in higher-end Presage and Prospex models. The extended reserve is achieved through a longer mainspring while maintaining the same 21,600 vph beat rate. Accuracy is tightened to -15/+25 seconds per day compared to the 4R35's wider tolerance. Represents Seiko's push to compete with Swiss movements offering 80-hour reserves.
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
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The market
Market prices.
Retail$1,350
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Retail stock & market context
Seiko on the secondhand market
+10.5%
2026 so far · +5.8% to +16.3% · 91 matched watches
In line with the index
Divers as a group: +6.5% · 339 matched watches
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The community take
Owners talk.
The Seiko Prospex Sea 1970 Heritage Diver's Save the Ocean Special Edition is praised for its beautiful design and refinement over previous models, featuring vertically textured glacier-inspired dials. Owners, however, consider the €1500 RRP too high, suggesting a price closer to €900-€1000, noting the aluminum bezel insert instead of ceramic. Some owners report the 6R movement runs slow. On balance, owners find the Seiko Prospex Sea 1970 Heritage Diver's Save the Ocean Special Edition beautiful and a refinement, but the price and aluminum bezel are points of contention.
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