JB100 - Made by Toyoda Automatic Loom Works under Nagoya supervision.  Straight crossguard, contoured grip with screws, bright fullered blade.   This is a very rare bayonet and many question it's existence.  It has been reported that many examples that had blued blades originally have had the blade buffed to enhance the value of the example.  I can find no evidence of any blue in the recesses of this example.  I have included 2 closeups of the blade. I believe the JB100 was made up of a handle/straight crossguard with an earlier leftover unblued blade.  The throat piece of the scabbard is inspection stamped.  Incredible condition, also.