Spain 1961 World Stamp Day (Día Mundial del Sello) 10 Ptas Postage Stamp

This is a rectangular postage stamp from Spain, issued in 1961 to commemorate World Stamp Day (Día Mundial del Sello). The stamp is printed in a monochromatic olive-green or sage-green ink on white paper with standard perforations. The central design depicts a stylized dove, representing a messenger, carrying a smaller stamp in its beak. At the top, the country name 'ESPAÑA' is printed in a clean sans-serif typeface. The bottom right corner features the denomination '10 PTAS' (Pesetas), and 'CORREOS' is inscribed at the bottom left. A notable manufacturing mark is the 'F. N. M. T.' printed at the very bottom center edge, indicating it was produced by the Fábrica Nacional de Moneda y Timbre. The stamp is heavily postmarked with a circular 'DIA MUNDIAL DEL SELLO' commemorative cancellation dated '6 - MAYO - 1961'. There are also wavy line cancellations and a partial black ink-stamp 'CE' at the bottom. The condition shows significant usage wear: the perforations are uneven, particularly on the left and right edges, with some fraying and blunted tips. The centering is slightly shifted toward the bottom left. The heavy cancellations obscure a large portion of the central graphic, which is typical for post-consumed specimens but affects aesthetic clarity. Overall, it serves as a mid-century philatelic example of Spanish postal history.