Quote:
	
	
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					Originally Posted by Battara
					
				 I thought true traditional nihonto was forbidden to leave Japan.    | 
	
 Only in the case of blades (and other categories of art) deemed important enough by the Ministry of Culture to be National Treasures, and in such case must remain in-country.
Otherwise, swords are free to come and go, though ownership in Japan is subject to registration requirements, and export requires permit and paperwork .  I was informed by a sword dealer and polisher that this tight regulation of weapons goes all the way back to rules laid down during the  postwar US occupation.