Looks good to me and has some definite age going on the 3 mounting holes
To get information on Japanese Items I always go to this site,
https://www.militaria.co.za/
I would recommend you joining this group to get a full understanding of what you have.
However, there are some vultures who may PM you looking to purchase from you, personally I just ignore these people but that is up to you.
Regards,
Ken