Iain,
Thanks for showing these Thai-Japanese hybrids. If I recall correctly, some of these have been attributed to the late Ayutthaya/early Rattanakosin period. There are some elegant high end examples from Thai nobility that were posted here on the old UBB Forum (now defunct) and were attributed to that period.
The Rattanakosin period commenced in 1782, which is why I thought your sword may date from around that time (i.e., 18th C). The maximum zone of influence of Rattanakosin included the vassal states of Cambodia, Laos, Shan States, and the northern Malay states. It's possible that Japanese influence diffused through some of the major centers of this region as a result of Thai dominance.
Regards,
Ian
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