Yeah, the habaki looks a bit strange. I'm not sure if its original to the blade. I got this from a big auction house in San Francisco. This was the description...
Rare Early 14th-Century Japanese Nihonto
30-1/2" blade, circa early 14th Century, with visible temper line and engraved characters on left side. Tang signed with long signature (Etchu ... Nori Shige). Silver ferrule engraved with characters and wave motifs, pierced oval iron tsuba with figural motifs, 12" rayskin grip with light sienna cord wrap and fine dragon, menuki and engraved kashira. Maroon lacquered wooden saya with single mount. Contained in associated purple and gold brocade bag with braided purple cord wrap and tassels. Overall length: 47"
Condition: Very good. Blade fine with only light wear present. Minor polish. Grip with moderate wear to cord wrap. Saya with stable hairline crack and minor wear overall.
I am very thankful that you folks have taken your time to look at this for me. I'm having fun collecting and trying to learn about the history of the blades. Its all very fascinating. I have a few other photos of the nice grain of the metal which I'll post in a while. I need to make the files smaller.