Mirror? 4 1/2 pounds of bronze 12 1/4 Inch diameter Case is beautiful

Beautiful but damaged case has a missing piece, and there is space enough inside the case to perhaps have had something to mount the mirror.
I’ve found several like this mirror but none authoritative, none consistent. None were showing a case.

Of course there is the question about the mirror. I can see several tiny specs that sparkle compared to the tarnished surface

 

Forgot mirror

 

Beautiful. I don't see damage to the case. I would guess Japanese. Writing should answer a lot of your questions and you should get it translated. Maybe had a lacquered wooden handle that has been removed/lost?

 

https://www.worthpoint.com/worthopedia/imperial-japanese-samurai-ladies-75649015 ($79)

https://www.worthpoint.com/worthopedia/antique-geisha-brass-hand-mirrors-1927559527 ($65)