My dad has an old ww2 type 30 nagoya bayonet. We were able to identify it by the the nagoya arsenal marking on the blade, however we were wondering how much it would be worth. I was able to read the serial number on the bottom of the handle. the number is 85577 or 08557. The 8 was kinda worn and was hard to read so I don't know if there was a 0 in front of it or not. Please reply with anything you could tell me about this specific bayonet, that would be nice.