I think this keris of the Mataram kingdom era, and from the opinion of some my friends, they thought possibility from the 'Mataram Srimanganti' era (Mataram kingdom after Sultan agung king, around the 17th century and Srimanganti is name from the room in Mataram royal palace, but not mean that this keris was made in the palace), in their opinion is based on the metal, pamor, and style.
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