This Spanish commemorative stamp was issued in 1994 to mark the 500th anniversary of the Treaty of Tordesillas (1494–1994). The treaty, signed between Spain and Portugal, divided the newly discovered lands outside Europe along a meridian 370 leagues west of the Cape Verde islands—shaping colonial expansion in the Americas and beyond.

The design depicts the Casa del Tratado in Tordesillas, the historic building where the agreement was signed. Rendered in green architectural lines over a soft orange background, the stamp combines simplicity with symbolic depth, reflecting the pivotal diplomatic act that defined early modern geopolitics.