Here is another very interesting sword on eBay:
http://cgi.ebay.de/ws/eBayISAPI.dll?...MEWA:IT&ih=008
I am pretty sure that it is NOT a Japanese sword: the blade geometry is totally different, the blade is made from file, there is no habaki, using of rattan and the suspension ring are also not Japanese, and so on. But it is definitely Japanese inspired, old, original and SE Asian in origin. Maybe it is from Korea or Indonesia or ????