Thanks for posting the additional pics! (I was slow with my reply...

)
Quote:
Close up of details of #3:
Wrangka, inlaid front and plain back
Buntut, inlaid front and plain back
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The plain backsides do look carabao to me. The front sides don't come out very well but are mottled and seem to have a different surface structure: could be tortoise, indeed.
Regards,
Kai