from various sources esp from my spiritual teacher in kerisology, kerises of pre sultan agung era were very limited in numbers because keris was quite exclusive to certain level of society only, keris was also expensive to commission as those days payment to the empu was some what like at least a buffalo for a pusaka keris. However, during Sultan Agung era, where commerce with other nations blossomed, raw material became easily available, wealth and standard of living improved thus moe ppl could afford pusaka kerises, not to mention the sultan agung himself encouraged the keris culture and inspired as seen in todays keris culture. So, its safe to say, that most very aged keris if authentic, must be from sultan agung era and after
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