Here is my latest toli mirror, Japanese in origin, probably Jo(u)mon or Ainu, maybe from the Kofun tumuli or a copy. My largest by far, at 7 inches diameter. I’m checking on the origin of two other of my Japanese mirrors, and my thanks to Rie Hanazono for her help! 
A blogger called Heritage of Japan has much information and has asked me questions about Japanese mirrors but I can’t seem to make contact – anyone know who runs the blog, please? Here’s the mirror, which has creatures dancing around the boss on the back, underneath the patina which I won’t disturb:
Fyre Shaman's photo.
Fyre Shaman's photo.
EDIT: Curiosity got the better of me so I cleaned off a little of the patina to see what lay beneath: