Hello Jose,
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				I have seen and even owned one just like this with provenance of the 1960s.
			
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 Works for me. Did the provenance establish production in the 60s? If so, where did it originate from?
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				Kai, I would like to see your research and references regarding the Mindanao production of early kris without separate gangas.
			
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 No research yet, at least not conclusive enough for publication.
I'll try to post a few examples later.
Regards,
Kai