Amadeus I of Spain was an Italian prince from the House of Savoy, who for a short period from 1870 to 1873 was king of Spain. He was a younger son of King Victor Emanuel II of Italy and was known throughout most of his life as the 1st Duke of Aosta. Today’s stamp is from 1872. It shows a portrait of King Amadeo I and has a face value of 1 Peseta (Pta).