Issued by Portugal for use in Mozambique (Ilha de Moçambique), this commemorative marks the 400th anniversary of Os Lusíadas, the epic poem by Luís de Camões celebrating Portuguese maritime exploration. The design beautifully depicts the fortified island settlement with period caravels sailing offshore, linking literature with the Age of Discovery. Rich maritime artwork, banners, and historical flags give the stamp strong thematic appeal for colonial and nautical collectors. Printed by Lito Maia (Porto), it is prized for its detailed engraving-style illustration and classic 1970s color palette. A desirable piece for Portugal colonies, exploration history, and literature-themed collections.