Seiko Goes Mangrove Diving With $5,700 Limited Edition Save the Ocean Deep Green Marinemaster
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- Seiko’s latest Prospex Marinemaster draws inspiration from Okinawa’s mangrove forests, pairing a vibrant green dial with a pink-gold-coloured seconds hand.
- The 42.6 mm professional diver features the Calibre 8L45 automatic movement, a 72-hour power reserve and 300 metres of water resistance.
- Limited to 900 pieces worldwide, the Marinemaster 1968 Heritage Save the Ocean Limited Edition costs AUD $5,700.
There’s something rather amusing about building a 300-metre professional dive watch inspired by Okinawa’s mangrove forests, where the water is often shallow enough to stand in. But Seiko has never been one to shy away from taking a creative dive with its timepieces, even when the inspiration comes from somewhere closer to the surface than the depths of the ocean.
The Japanese watchmaker’s new Prospex Marinemaster 1968 Heritage Save the Ocean Limited Edition takes its cues from the coastal mangrove forests of Okinawa. The main attraction on this sightseeing tour is obviously that decadently rich green dial, with the natural hue completed by a pink-gold-coloured seconds hand, adding a touch of warmth and humidity to an otherwise purposefully cool-looking stainless-steel diver. It’s a striking departure from the more traditional black-and-blue dials we tend to associate with underwater watches.
At AUD $5,700, it’s not exactly the most affordable dive watch, but a trip to the mangroves isn’t totally out of budget. It’s a touch more expensive than the $4,550 Prospex Marinemaster (ref. SLA079J1), a black-dial model with the same 42.6 mm case diameter and 300-metre water resistance. The new Save the Ocean edition costs $1,150 more, but it offers an upgraded automatic movement, a distinctive new colour scheme, and a production run limited to just 900 pieces worldwide.
A Decadent Dive Watch With a Greener Outlook
Wading into the shallows, the striking green dial sits atop the same 1968-inspired Marinemaster design Seiko has been refining for decades.
The stainless-steel case retains most of the original look and feel, measuring 42.6 mm across, 14.1 mm thick, and 49.3 mm lug-to-lug. It features a ceramic bezel insert, dual-curved sapphire crystal, LumiBrite on the hands, indices, and bezel, and a screw-down crown. With 300 metres of water resistance, it’s considerably better equipped for a deep dive than a leisurely wander through the mangroves.
Inside, Seiko has fitted its Calibre 8L45 automatic movement, offering approximately 72 hours of power reserve and a stated accuracy of +10 to -5 seconds per day. That’s a meaningful step up from the Calibre 8L35 in the SLA079J1, which offers around 50 hours of power reserve and a rated accuracy of +15 to -10 seconds per day.
Beyond the movement, one practical feature worth highlighting is the steel bracelet’s clasp, which offers 16 mm of adjustment in 2 mm increments, making it easier to tighten or loosen without a tool.
Whether the green dial and added exclusivity justify the near-$6,000 price tag is up to you. But if you like your professional dive watches with a little more colour than the usual black or blue, this Marinemaster certainly isn’t hiding beneath the surface.
Seiko Marinemaster 1968 Heritage Save the Ocean – Key Specs
- Reference: HBF003J1
- Movement: Calibre 8L45, automatic with manual winding
- Power reserve: Approximately 72 hours
- Accuracy: +10 to -5 seconds per day
- Case: Stainless steel, 42.6 mm diameter
- Thickness: 14.1 mm
- Lug-to-lug: 49.3 mm
- Dial: Mangrove-inspired green with pink-gold-coloured seconds hand
- Bezel: Unidirectional rotating, ceramic display
- Crystal: Dual-curved sapphire with inner anti-reflective coating
- Water resistance: 300 metres
- Bracelet: Stainless steel, three-fold clasp with 16 mm slide adjustment
- Price: AUD $5,700
- Availability: Seiko Boutique limited edition, 900 pieces worldwide; shipping expected November/December 2026
The Seiko Prospex Marinemaster 1968 Heritage Save the Ocean Limited Edition (Ref. HBF003J1) is listed on Seiko’s Australian website for AUD $5,700, with only 900 produced worldwide.
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