This is a classic South African revenue stamp from the 1930s, inscribed “SUID-AFRIKA” and “POSSEEL INKOMSTE” (meaning "Revenue Income" in Afrikaans). The design features a detailed sailing ship in black within an ornate red frame, with a central 1d (one penny) denomination. These stamps were used for fiscal purposes rather than postal, making them a specialized area of collecting. The ship motif connects to South Africa’s maritime heritage and the era of exploration. A fine example for collectors focusing on revenue issues, South African philately, or nautical themes.