This straight-bladed ('lurus') keris features 'Ganja Iras', which means the blade does not have a separate ganja, but rather it is made out of the blade itself. The dapur of this keris is 'Tilam Upih'. Tilam Upih can be translated as 'white (bed)sheet(s)' which implies living a straight (hence 'lurus' instead of 'luk') and honest life, thereby allowing the life within one's family to be peaceful and harmonious.
The pamor is not so clear because the blade needs to be cleansed ('warangi') first. But based on the current condition of the blade we can say that the pamor will most likely be either 'Adeg' or 'Banyu Mili'. Pamor Adeg is a common design. This type of pamor is believed to contain certain esoteric powers of evasion of 'guna-guna' (occult/black magic), sickness, and natural disasters such as storms and floods.
Pamor Banyu Mili, also known as 'Toya Mili', is in many ways similar to pamor Adeg, though it often has a lesser refined design. The lines on the surface of the blade resemble a stream of flowing water. This type of pamor is said to enhance one's social relationships with people from all layers of society.
As to the estimated era ('tangguh') in which this keris was made, it is estimated to be Tuban Majapahit (1294 - 1474).