In a very informative but not too scholarly book "The Vanishing Tribes of Burma" Richard K Diran, available from amazon, some nice pictures of Burmese young ladies
. The Shan, Yao, and Hmong all have groups in Burma, Loas and Thai borders, the Golden Triangle, so I think trying to be sure of the swords origin is really quite tricky. I must say I rather like the idea of saying "Golden Triangle" Tim