score:17
A little googling and matching the makers marks indicates that this is a Japanese bayonet, known as a Type 30
Some 8.4 million were produced, and it remained in front-line use from the Russo-Japanese War to the end of World War II. All Japanese infantrymen were issued with the Type 30, whether they were armed with a rifle or pistol, or even if they were unarmed. Because of its reliability, it was a valuable tool for the Japanese army.
Someone asked about a similar weapon on a forum here where a user posted a sheet showing the makers marks. This includes one matching yours indicating origin at the Toyada Jido Shokki Seisakusho Arsenal or the Toyoda Automatic Loom works.
Here is an image of one from the Australian war Museum
(You can see yours seems to have part broken off the top.)