This is very rough in construction. Straight quillon with a squared pommel, this Type 30 was made at Toyoda Jidoshoki Seisakusho (Toyoda Automatic Loom Works) under Nagoya supervision, late in the war. The leather frog appeared to be attached to the sheath for a long time, until some drongo tried to carefully remove it and it broke off
This is without a doubt, the most rudimentary bayonet I own - The scabbard is very roughly constructed, with no markings. Things must have been desperate!