Hello Colin,
to my opinion your mandau is very well from the 1920's and originates from the Sarawak (;English side of Borneo) from the Iban-tribe, which I see from the so-called 'elbow-carvings' (which suppose to be leeches).
Often pieces, under which mandaus, where made and carved on order by the Chief with the special intention of giving them to special friends/important visitors. Hence the very nice details (but slightly unpractical) on the sheath and the lack of usagepatine.
Best regards,
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