A striking triangular postage-due (timbre-taxe) stamp from the République Islamique de Mauritanie, featuring the elegant Grey Crane (Grue cendrée) in a marshland setting. Printed in soft yellow, orange, and black tones, this issue showcases classic French-colonial engraving style with fine detail in the bird’s plumage. Designed by R. Serres and engraved by G. Bétemps, this is a desirable wildlife-thematic item for African fauna collectors. A beautifully centered example, ideal for exhibits focusing on birds, triangular issues, or Mauritania’s early postal history.