I go back to my reply (#4 above) in which IMHO the "coin" may have no bearing on the origin of the Dha itself. What I should perhaps have added is the the Chinese Province of Yunnan borders Burma, Laos, Cambodia to the north, and indeed Dha also originate from there. The dha you have, do not however show typical Yunnan traites such as a typical chinese style hand guard and typical scabbard decoration. (Pic attached) The coin though could well have come from that region.
Stu
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