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New release review / Automatic winding

Seiko Marinemaster HBF003: a green ocean and calibre 8L45

The limited Save the Ocean pairs a green dial with the automatic 8L45 and a 72-hour power reserve.

Published 16 October 20262 min read
Prospex Marinemaster Save the Ocean
Seiko · Image source

The essentials first

In one minute

Case42,6 mm
Calibre8L45
Power reserve72 h

Why it is interesting

The bracelet's broad adjustment range is more practical than decorative details: fit can be changed in small steps.

Things to consider

At 14.1 mm thick, the case retains substantial height; this is not a compact version.

Save modelCompare with other models

Seiko · Prospex Marinemaster Save the Ocean

The model in detail

In a report dated October 12, the Seiko Prospex Marinemaster HBF003 appears as a Save the Ocean edition inspired by mangrove forests. A rose-gold-coloured seconds hand complements the green dial. The boutique edition is limited to 900 pieces, with deliveries announced for November 2026.

The HBF003J1's green dial and rose-gold-coloured seconds hand.Enlarge

The HBF003J1's green dial and rose-gold-coloured seconds hand.

© Seiko · Source

The official specification confirms a 42.6 × 14.1 mm steel case, ceramic bezel and 300-metre diver's water resistance. Calibre 8L45 runs at 4 Hz, with a stated rate of −5/+10 seconds per day. The clasp adjusts over 16 mm in 2 mm increments.

Sources

Seiko — Prospex HBF003J1www.seikowatches.comHypebeast — Marinemaster HBF003, 12.10.2026hypebeast.com · 12 October 2026

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