Hello Amuk,
Thanks for your contributions!
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				The tang would be about 10 cm.
			
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 Are you sure?
Here's a pic of a pesi which seems to be unaltered and is only about half the length you give. (I'm going to post the exact measurements later.)
I may have seen a dozen other pesi of this keris type but all had unspectacular sizes. Any pic of those (partially) flattened pesi would be great, too!
Regards,
Kai