A lenticular ("3-D") pictorial postcard showing the watchtower (garita/torre de la vigía) of the Castillo de la Real Fuerza in Old Havana, crowned by its emblematic bronze weathervane, La Giraldilla. The vertically ribbed lenticular lens gives the image stereoscopic depth and the characteristic fine ridging visible in a flat photograph. The composition looks up at the cylindrical tower against a graded blue sky; three small figures (apparently young people in 1970s dress) are seated on the masonry terrace at lower left, against the fortress's sloping limestone wall. The reverse is a printed postcard back in the Spanish-and-English bilingual convention, headed "TARJETA POSTAL," with a vertical divider labeled "REPÚBLICA DE CUBA," a dotted stamp box, and three address rules. The caption reads "CASTILLO DE LA FUERZA / Ciudad de La Habana / LA FUERZA CASTLE / Havana City." Centered at the foot is the printer's line "Impreso en Pyongyang, RPDC" (Printed in Pyongyang, DPRK — i.e., the Democratic People's Republic of Korea). The card is unposted and heavily age-toned, with overall browning and edge wear.