Received this today as a gift, pretty cool I think. I was told it is a WWII Japanese bayonet, brought back by a soldier. It's a little rusty, but assuming it's not worth any significant value, I'd bet I can clean it up. (Would you try to restore this if it was yours?) Using this site for a reference - http://www.radix.net/~bbrown/japanese_markings.html It's a straight quillon design, manufactured by the Toyoda Jidoshoki Seisakusho (Toyoda Automatic Loom Works) under Nagoya supervision. The butt of the handle is marked "2-11-49". This seems odd to me, since WWII was over in 1945, yes? Were they still producing rifles and bayonets 4 years later in Japan? Maybe my eyes are just playing tricks on me, but it sure looks like "49" to me. The blade is straight, with a few small chips along the edge here and there. It looks used, but maybe because a previous collector tried cutting with it or something stupid. The blueing is starting to come off obviously. The cool part is it gets sharper as you get closer to the tip. The tip is still sharp enough to cut my finger if I'm not careful. EDIT - Now that I think about it, the date format might be different in Japan. As in year/month/day. So maybe it's really 1942, November, 09? But it really looks like a "49" to me unless there is a pit in the steel right above the "-" so it just looks like a "4"? Either way, I believe it to be authentic.