The keris Jalak Sangu Tumpeng is a straight-bladed dapur, made in the tangguh Singosari era (1222–1292 CE). Its dapur consists of a plain gandik, with a pejetan, a double sogokan, tikel alis, sraweyan, and tingil. Although this dapur features relatively few ricikan, yet it nonetheless has received a royal status, since the Sultan's Palace ('Keraton Kesultanan') of Yogyakarta owns two royal pusaka heirloom kerises that both have a Jalak Sangu Tumpeng dapur. These are, of course, the well-known Kanjeng Kyai Ageng Kopek and the Kanjeng Kyai Danuwara.
It is believed, that a keris with a Jalak Sangu Tumpeng dapur possesses mystic powers that can be used by its owner to acquire material wealth. Hence, a keris Jalak Sangu Tumpeng is mostly kept by business and salesmen, shopkeepers, and traders, who thereby seek for blessings to increase their success and riches.
As to the pamor pattern, this rare and old keris is forged with the Wiji Timun motif, which covers the blade from the base to tip. In Javanese, Wiji Timun is sometimes also called 'Miji Timun'. In Indonesian, however, this type of pamor is known as 'Biji Ketimun', which means cucumber seeds. As it is classed as a pamor rekan, the empu thus forged this pamor motif intentionally, because it is said, that the esoteric aspects of the Wiji Timun pamor pattern enhance the owner's charisma. And so, the pamor of this keris is made to increase the owner's authority and popularity.