I just came across this large Tanto. Not stored well, but in sound condition. It is approximately 14 1/8" tip to Hamachi. The Hamon is Nioi. The Hada looks like large Mokume almost Ayasugi. The Hada has areas that appear almost the same color as the Hamon. Along the back of the tip, there are very fine parallel polishers lines. The file marks on the Nakago look like some I have seen on some Gendaito. The Mune of the Nakago is slightly rounded. I am thinking it is late Shin-Shinto, relatively young. It has been a long time since I cracked any books and did any studying. I apologize for my poor quality pictures. Any thoughts on what it might be? Pictures here. http://halkct.myphotoalbum.com/view_album.php?set_albumName=album63Hal