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The stamp 600FG depicts copy of the painting Roy Cross: « The Ocean Sentinel» 'A fine naval frigate drives along before the wind in the glow from the setting sun, accompanied by a small cutter as her tender.' Additional information about the ship, is welcome.

Republique Democratique du Congo 2006 600FG SG?
Source: forum.woodenboat.com / showthread.php? 80,245-Tall-Ships
From Wikipedia, the free encyclopedia

Have not the stamp but the ship OCEAN SENTINEL is not in Ships of the Royal Navy by J.J. Colledge.