The second knife with the wrapping on the sheath reminds me of the type of wrapping often used by the Taiwanese aborigines of the western plains (Ping Pu) esp. with Han influence.
The mouth of the sheath reminds me of southern Chinese (guangdong, fujian, zheijiang) sheaths and scabbards...
the metal-work on that handle... not sure, but makes me think Chinese influenced SE Asian...
