In this paper, we present a detailed examination of a sword dating from the Southwestern Middle Bronze Age, which was found several years ago during farming activities near the town of Serpa, Portugal. The sword was apparently found out of an archaeological context. The finder of the sword, who kindly allowed us to study it, cleaned the artefact of its corrosion and kept it in good conditions. The sword is about 50 cm long and its handle show two rivets (another one is missing) which are kept housed in notches. The rivets’ heads are spherical caps covered with a golden leaf. The use of a p-EDXRF equipment allowed us to determine and quantify the elemental composition of the blade, as well as of the golden leaf covering the rivet heads. It was thus possible to establish that the blade was manufactured with arsenical copper, while the composition of the golden leaf refers to a natural alloy. Finally, the Monte das Oliveiras sword is compared with several other coeval examples of Southern Iberia weaponry. Its hilt design, namely the three peripheral notches, seems to be of an unique variant in swords, being relatively rare in similarly shaped weapons, such as daggers.