The postcard shows a watercolor artwork by Agustin(?) Goy entitled Mangoes. I found no information regarding the artist, about the painting nor its location (private collection or museum).
In the Philippines, unripe mango is eaten with bagoong. Dried strips of sweet, ripe mango are also popular, with those from Cebu exported worldwide. Guimaras island is also a major producer of a particularly delicious mango.