This finely engraved Polish stamp depicts an 18th-century line warship (Liniowiec Okręt Wojenny), representing the powerful sailing battleships that dominated European naval warfare. Rendered in detailed green line engraving, the design highlights complex rigging, sails, and hull construction typical of classic naval vessels. The issue celebrates maritime engineering and historical naval traditions preserved in Polish cultural memory. Ship-themed collectors value this stamp for its clean maritime artwork and historical authenticity. A strong thematic addition for naval, transport, or sailing ship collections.