Seiko Prospex Marinemaster 1968 Heritage Diver: Calibre 8L45 Leads a 300m Flagship Refresh
Seiko reworks its flagship 300m Marinemaster with the in-house Calibre 8L45, a redesigned clasp with on-the-fly adjustment, and a ceramic bezel — served two ways: a permanent black edition and a blue JAMSTEC limited run celebrating half a century of Arctic exploration. We went hands-on with both.
