SCG3491 - Spain 1963 – Centenary of the International Postal Conference, Paris 1863This Spanish 1 PTA stamp, issued in 1963, commemorates the 100th anniversary of the first International Postal Conference held in Paris in 1863. The stamp features a vintage mail coach in motion, symbolizing the historic evolution of postal transport. Behind it stands a building reminiscent of 19th century Parisian architecture. This conference laid the groundwork for international postal cooperation, which eventually led to the formation of the