Sorry Ian, I disagree a little bit with you, I would say that it is Jingpo dao (Kachin), from time to time used by different Naga people but it's a pure Jingpo sword. See also here:
https://www.mandarinmansion.com/glossary/lin-gin and here:
http://www.vikingsword.com/vb/showth...ghlight=kachin, also here:
http://www.vikingsword.com/vb/showth...ghlight=kachin and in this thread by #4 you stated it yourself:
http://www.vikingsword.com/vb/showth...ghlight=kachin 
Regards,
Detlef