My gut feeling is Chinese. The diamond wedge shape and leaf shapes were common for their daggers, and ring pommels were very widespread in the world of Chinese blades. Also many were wrapped in cloth/grip of some sort.
Other fighting knives of southern China, including butterfly swords or baat jam do, have that wedge like blade with a thick spine...
Maybe it is from southern China and found its way somehow into the collection... or maybe a Chinese-descent Hokkien or Hakka person in SE Asia, such as Sumatra, Java, Thailand, or Philippines carried a knife from their own ethnic group for protection..
