Originally Posted by Timo Nieminen
Thai blades can look a lot like Japanese blades (Imports re-mounted locally? The Japanese exported naginata to SE Asia).
In 1635 Tokugava regime strong prohibied weapon export from Japan, including blades. After 1635, 7 - 10 years, not more, sword and blades exported illegal by dutch and portugese vessels.
In Vietnam, Siam, Kambodga making weapon in japonese style, possible, by help bladesmiths and other craftmen from japanese diaspora.