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Seiko Prospex Sea 1968 Heritage Diver's GMT Watch
$1,700Stock unknown
Case
- Diameter
- 42mm
- Thickness
- 13.3mm
- Lug-to-lug
- 48.6mm
- 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 6R54
- Type
- Automatic
- Power reserve
- 72h
- Jewels
- 24
Design language
- Case shape
- round
- Dial style
- matte
- 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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Retail$1,700
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Active listings5Across watch forums
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Retail stock & market context
Seiko on the secondhand market
+10.5%
2026 so far · +5.9% to +16.1% · 91 matched watches
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Divers as a group: +6.5% · 340 matched watches
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The community take
Owners talk.
The Seiko Prospex Sea 1968 Heritage Diver's GMT Watch offers a 300-meter depth rating and a caller-style GMT complication powered by the Caliber 6R54 movement, which provides a 72-hour power reserve. Reviewers note its refined clasp with extensive micro-adjustment. However, the movement's accuracy, ranging from +25 to -15 seconds per day, is considered a drawback by some. Overall, reviewers highlight the Seiko Prospex Sea 1968 Heritage Diver's GMT Watch as a good reminder of Seiko's value, despite the wide accuracy range of its movement.
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